Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified
|
Total
USD ($)
|
Preferred Shares
USD ($)
|
Common Shares
USD ($)
|
Preferred Shares
USD ($)
|
Common Shares
USD ($)
|
Additional Paid-in Capital
USD ($)
|
Additional Paid-in Capital
Preferred Shares
USD ($)
|
Additional Paid-in Capital
Common Shares
USD ($)
|
Cumulative Distributions in Excess of Net Income
USD ($)
|
Accumulated Other Comprehensive Loss
USD ($)
|
Noncontrolling Interests
USD ($)
|
Corporate Office Properties, L.P.
USD ($)
|
Corporate Office Properties, L.P.
Preferred Shares
USD ($)
|
Corporate Office Properties, L.P.
Common Shares
USD ($)
|
Corporate Office Properties, L.P.
Common Shares
USD ($)
|
Corporate Office Properties, L.P.
Common Shares
Preferred Shares
USD ($)
|
Corporate Office Properties, L.P.
Common Shares
USD ($)
|
Corporate Office Properties, L.P.
Accumulated Other Comprehensive Loss
USD ($)
|
Corporate Office Properties, L.P.
Noncontrolling Interests
USD ($)
|
Corporate Office Properties, L.P.
Limited Partner
|
Corporate Office Properties, L.P.
Limited Partner
Preferred Shares
USD ($)
|
Corporate Office Properties, L.P.
General Partner
|
Corporate Office Properties, L.P.
General Partner
Preferred Shares
USD ($)
|
Corporate Office Properties, L.P.
General Partner
Preferred Shares
USD ($)
|
Balance at Dec. 31, 2010 |
$ 1,314,138
|
|
|
$ 216,333
|
$ 669
|
$ 1,295,592
|
|
|
$ (281,794)
|
$ (4,163)
|
$ 87,501
|
$ 1,314,825
|
|
|
$ 1,083,963
|
|
|
$ (4,447)
|
$ 10,176
|
|
$ 8,800
|
|
$ 216,333
|
|
Balance (in units/ shares) at Dec. 31, 2010 |
66,931,582
|
|
|
|
|
|
|
|
|
|
|
|
|
|
69,668,226
|
|
|
|
|
|
|
|
|
|
Balance (preferred units) at Dec. 31, 2010 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
|
8,121,667
|
|
Increase (Decrease) in Shareholders' Equity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Conversion of common units to common shares (100,939, 234,246 and 311,343 shares in 2011, 2012 and 2013, respectively) |
0
|
|
|
|
1
|
1,520
|
|
|
|
|
(1,521)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Issuance of common units to COPT to balance units owned with common shares |
100,939
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,666,083
|
|
|
|
|
|
|
|
|
|
Shares issued to the public (in dollars) |
145,367
|
|
|
|
46
|
145,321
|
|
|
|
|
|
145,367
|
|
|
145,367
|
|
|
|
|
|
|
|
|
|
Shares issued to the public (in units/shares) |
4,600,000
|
|
4,600,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Exercise of share options (in dollars) |
2,461
|
|
|
|
2
|
2,459
|
|
|
|
|
|
2,461
|
|
|
2,461
|
|
|
|
|
|
|
|
|
|
Share-based compensation (in units/shares) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
302,226
|
|
|
|
|
|
|
|
|
|
Exercise of share options (in units/shares) |
191,264
|
|
|
|
|
|
|
|
|
|
|
|
|
|
191,264
|
|
|
|
|
|
|
|
|
|
Share-based compensation |
|
|
|
|
2
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based compensation |
|
|
|
|
|
14,265
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based compensation |
14,267
|
|
|
|
|
|
|
|
|
|
|
14,267
|
|
|
14,267
|
|
|
|
|
|
|
|
|
|
Restricted common units/shares redemptions |
(114,687)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(114,687)
|
|
|
|
|
|
|
|
|
|
Restricted common units/shares redemptions (in dollars) |
(3,990)
|
|
|
|
|
(3,990)
|
|
|
|
|
|
(3,990)
|
|
|
(3,990)
|
|
|
|
|
|
|
|
|
|
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |
0
|
|
|
|
|
(2,798)
|
|
|
|
|
2,798
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Comprehensive income (loss) |
(124,669)
|
|
|
|
|
|
|
|
(119,428)
|
2,430
|
(7,671)
|
(124,664)
|
|
|
(144,088)
|
|
|
2,610
|
52
|
|
660
|
|
16,102
|
|
Dividends/Distributions |
(132,819)
|
|
|
|
|
|
|
|
(132,819)
|
|
|
(141,344)
|
|
|
(124,582)
|
|
|
|
|
|
(660)
|
|
(16,102)
|
|
Distributions to owners of common and preferred units in COPLP |
(7,833)
|
|
|
|
|
|
|
|
|
|
(7,833)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Contributions from noncontrolling interests |
261
|
|
|
|
|
(23)
|
|
|
|
|
284
|
261
|
|
|
(23)
|
|
|
|
284
|
|
|
|
|
|
Distributions to noncontrolling interests |
(16)
|
|
|
|
|
|
|
|
|
|
(16)
|
(16)
|
|
|
|
|
|
|
(16)
|
|
|
|
|
|
Adjustment to arrive at fair value of redeemable noncontrolling interest |
(1,315)
|
|
|
|
|
(1,315)
|
|
|
|
|
|
(1,315)
|
|
|
(1,315)
|
|
|
|
|
|
|
|
|
|
Tax benefit (loss) from share-based compensation |
47
|
|
|
|
|
47
|
|
|
|
|
|
47
|
|
|
47
|
|
|
|
|
|
|
|
|
|
Balance at Dec. 31, 2011 |
1,205,899
|
|
|
216,333
|
720
|
1,451,078
|
|
|
(534,041)
|
(1,733)
|
73,542
|
1,205,899
|
|
|
972,107
|
|
|
(1,837)
|
10,496
|
|
8,800
|
|
216,333
|
|
Balance (in units/ shares) at Dec. 31, 2011 |
72,011,324
|
|
|
|
|
|
|
|
|
|
|
|
|
|
76,313,112
|
|
|
|
|
|
|
|
|
|
Balance (preferred units) at Dec. 31, 2011 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
|
8,121,667
|
|
Increase (Decrease) in Shareholders' Equity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Conversion of common units to common shares (100,939, 234,246 and 311,343 shares in 2011, 2012 and 2013, respectively) |
0
|
|
|
|
2
|
2,812
|
|
|
|
|
(2,814)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Issuance of common units to COPT to balance units owned with common shares |
234,246
|
|
|
|
|
|
|
|
|
|
|
234,246
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares issued to the public (in dollars) |
|
165,652
|
204,696
|
172,500
|
86
|
|
(6,848)
|
204,610
|
|
|
|
|
165,652
|
204,696
|
|
(6,848)
|
204,696
|
|
|
|
|
|
|
172,500
|
Shares issued to the public (in units/shares) |
|
6,900,000
|
8,625,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
8,625,000
|
|
|
|
|
|
|
6,900,000
|
Stock redeemed or called during period (in units/ shares) |
(55,000)
|
|
|
(55,000)
|
|
1,827
|
|
|
(1,827)
|
|
|
(55,000)
|
|
|
|
|
|
|
|
|
|
|
(55,000)
|
|
Stock redeemed or called during period, value |
|
(2,200,000)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(2,200,000)
|
|
Exercise of share options (in dollars) |
928
|
|
|
|
0
|
928
|
|
|
|
|
|
928
|
|
|
928
|
|
|
|
|
|
|
|
|
|
Share-based compensation (in units/shares) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
160,643
|
|
|
|
|
|
|
|
|
|
Exercise of share options (in units/shares) |
61,624
|
|
|
|
|
|
|
|
|
|
|
|
|
|
61,624
|
|
|
|
|
|
|
|
|
|
Share-based compensation |
|
|
|
|
1
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based compensation |
|
|
|
|
|
11,183
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based compensation |
11,184
|
|
|
|
|
|
|
|
|
|
|
11,184
|
|
|
11,184
|
|
|
|
|
|
|
|
|
|
Restricted common units/shares redemptions |
(139,851)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(139,851)
|
|
|
|
|
|
|
|
|
|
Restricted common units/shares redemptions (in dollars) |
(3,379)
|
|
|
|
|
(3,379)
|
|
|
|
|
|
(3,379)
|
|
|
(3,379)
|
|
|
|
|
|
|
|
|
|
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |
0
|
|
|
|
|
(4,627)
|
|
|
|
|
4,627
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Comprehensive income (loss) |
18,927
|
|
|
|
|
|
|
|
20,977
|
(3,702)
|
1,652
|
18,927
|
|
|
(656)
|
|
|
(3,871)
|
1,950
|
|
660
|
|
20,844
|
|
Dividends/Distributions |
(102,564)
|
|
|
|
|
|
|
|
(102,564)
|
|
|
(107,841)
|
|
|
(86,337)
|
|
|
|
|
|
(660)
|
|
(20,844)
|
|
Distributions to owners of common and preferred units in COPLP |
(5,277)
|
|
|
|
|
|
|
|
|
|
(5,277)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
COPT contribution to COPLP of distribution from subsidiary |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,608
|
|
|
|
(1,608)
|
|
|
|
|
|
Distributions to noncontrolling interests |
(655)
|
|
|
|
|
|
|
|
|
|
(655)
|
(655)
|
|
|
|
|
|
|
(655)
|
|
|
|
|
|
Adjustment to arrive at fair value of redeemable noncontrolling interest |
(3,955)
|
|
|
|
|
(3,955)
|
|
|
|
|
|
(3,955)
|
|
|
(3,955)
|
|
|
|
|
|
|
|
|
|
Tax benefit (loss) from share-based compensation |
43
|
|
|
|
|
43
|
|
|
|
|
|
43
|
|
|
43
|
|
|
|
|
|
|
|
|
|
Balance at Dec. 31, 2012 |
1,436,499
|
|
|
333,833
|
809
|
1,653,672
|
|
|
(617,455)
|
(5,435)
|
71,075
|
1,436,499
|
|
|
1,089,391
|
|
|
(5,708)
|
10,183
|
|
8,800
|
|
333,833
|
|
Balance (in units/ shares) at Dec. 31, 2012 |
80,952,986
|
|
|
|
|
|
|
|
|
|
|
|
|
|
85,020,528
|
|
|
|
|
4,067,542
|
|
80,952,986
|
|
|
Balance (preferred units) at Dec. 31, 2012 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
352,000
|
12,821,667
|
12,821,667
|
|
Increase (Decrease) in Shareholders' Equity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Conversion of common units to common shares (100,939, 234,246 and 311,343 shares in 2011, 2012 and 2013, respectively) |
0
|
|
|
|
3
|
3,994
|
|
|
|
|
(3,997)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Issuance of common units to COPT to balance units owned with common shares |
311,343
|
|
|
|
|
|
|
|
|
|
|
311,343
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares issued to the public (in dollars) |
117,961
|
|
|
|
45
|
117,916
|
|
|
|
|
|
117,961
|
|
|
117,961
|
|
|
|
|
|
|
|
|
|
Shares issued to the public (in units/shares) |
|
|
4,485,000
|
|
|
|
|
|
|
|
|
|
|
|
4,485,000
|
|
|
|
|
|
|
|
|
|
Stock redeemed or called during period (in units/ shares) |
(84,750)
|
|
|
(84,750)
|
|
2,904
|
|
|
(2,904)
|
|
|
(84,750)
|
|
|
|
|
|
|
|
|
|
|
(84,750)
|
|
Stock redeemed or called during period, value |
|
(3,390,000)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(3,390,000)
|
|
Issuance of common units resulting from common shares issued under at-the-market program (in units) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,500,000
|
|
|
|
|
|
|
|
|
|
Issuance of common units resulting from common shares issued under at-the-market program (in dollars) |
38,447
|
|
|
|
15
|
38,432
|
|
|
|
|
|
38,447
|
|
|
38,447
|
|
|
|
|
|
|
|
|
|
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units |
1,369
|
|
|
|
|
(1,296)
|
|
|
|
|
2,665
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
221,501
|
|
|
|
|
|
|
|
|
|
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in units) |
|
|
|
|
|
|
|
|
|
|
|
1,369
|
|
|
3,899
|
|
|
|
(2,530)
|
|
|
|
|
|
Exercise of share options (in dollars) |
779
|
|
|
|
|
779
|
|
|
|
|
|
779
|
|
|
779
|
|
|
|
|
|
|
|
|
|
Share-based compensation (in units/shares) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
184,292
|
|
|
|
|
|
|
|
|
|
Exercise of share options (in units/shares) |
39,331
|
|
|
|
|
|
|
|
|
|
|
|
|
|
39,331
|
|
|
|
|
|
|
|
|
|
Share-based compensation |
|
|
|
|
2
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based compensation |
|
|
|
|
|
7,603
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based compensation |
7,605
|
|
|
|
|
|
|
|
|
|
|
7,605
|
|
|
7,605
|
|
|
|
|
|
|
|
|
|
Restricted common units/shares redemptions |
(78,440)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(78,440)
|
|
|
|
|
|
|
|
|
|
Restricted common units/shares redemptions (in dollars) |
(2,002)
|
|
|
|
|
(2,002)
|
|
|
|
|
|
(2,002)
|
|
|
(2,002)
|
|
|
|
|
|
|
|
|
|
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |
0
|
|
|
|
|
(744)
|
|
|
|
|
744
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Comprehensive income (loss) |
109,699
|
|
|
|
|
|
|
|
93,707
|
8,915
|
7,077
|
109,699
|
|
|
77,006
|
|
|
9,313
|
2,749
|
|
660
|
|
19,971
|
|
Dividends/Distributions |
(115,216)
|
|
|
|
|
|
|
|
(115,216)
|
|
|
(120,156)
|
|
|
(99,525)
|
|
|
|
|
|
(660)
|
|
(19,971)
|
|
Distributions to owners of common and preferred units in COPLP |
(4,940)
|
|
|
|
|
|
|
|
|
|
(4,940)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Contributions from noncontrolling interests |
86
|
|
|
|
|
|
|
|
|
|
86
|
86
|
|
|
|
|
|
|
86
|
|
|
|
|
|
Distributions to noncontrolling interests |
(1,045)
|
|
|
|
|
|
|
|
|
|
(1,045)
|
(1,045)
|
|
|
|
|
|
|
(1,045)
|
|
|
|
|
|
Adjustment to arrive at fair value of redeemable noncontrolling interest |
(7,121)
|
|
|
|
|
(7,121)
|
|
|
|
|
|
(7,121)
|
|
|
(7,121)
|
|
|
|
|
|
|
|
|
|
Tax benefit (loss) from share-based compensation |
(122)
|
|
|
|
|
(122)
|
|
|
|
|
|
(122)
|
|
|
(122)
|
|
|
|
|
|
|
|
|
|
Balance at Dec. 31, 2013 |
$ 1,497,249
|
|
|
$ 249,083
|
$ 874
|
$ 1,814,015
|
|
|
$ (641,868)
|
$ 3,480
|
$ 71,665
|
$ 1,497,249
|
|
|
$ 1,226,318
|
|
|
$ 3,605
|
$ 9,443
|
|
$ 8,800
|
|
$ 249,083
|
|
Balance (in units/ shares) at Dec. 31, 2013 |
87,394,512
|
|
|
|
|
|
|
|
|
|
|
|
|
|
91,372,212
|
|
|
|
|
3,977,700
|
|
87,394,512
|
|
|
Balance (preferred units) at Dec. 31, 2013 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
352,000
|
9,431,667
|
9,431,667
|
|