Consolidated Statements of Equity - USD ($) $ in Thousands |
Total |
Common Shares [Member] |
Preferred Shares [Member] |
Common Shares [Member] |
Additional Paid-in Capital [Member] |
Additional Paid-in Capital [Member]
Common Shares [Member]
|
Cumulative Distributions in Excess of Net Income [Member] |
Accumulated Other Comprehensive Income (Loss) [Member] |
Noncontrolling Interests in Subsidiaries [Member] |
Corporate Office Properties, L.P. [Member] |
Corporate Office Properties, L.P. [Member]
Common Shares [Member]
|
Corporate Office Properties, L.P. [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
|
Corporate Office Properties, L.P. [Member]
Noncontrolling Interests in Subsidiaries [Member]
|
Corporate Office Properties, L.P. [Member]
Limited Partner [Member]
|
Corporate Office Properties, L.P. [Member]
Limited Partner [Member]
Preferred Shares [Member]
|
Corporate Office Properties, L.P. [Member]
General Partner [Member]
|
Corporate Office Properties, L.P. [Member]
General Partner [Member]
Preferred Shares [Member]
|
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
|
|
|
|
|
|
|
Balance (preferred units) at Dec. 31, 2012 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
|
12,821,667
|
Increase (Decrease) in Shareholders' Equity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Redemption of preferred shares/units |
|
|
(3,390,000)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(3,390,000)
|
Redemption of preferred shares/units (3,390,000 and 2,000,000 shares in 2013 and 2014, respectively) |
$ (84,750)
|
|
$ (84,750)
|
|
2,904
|
|
(2,904)
|
|
|
(84,750)
|
|
|
|
|
|
|
$ (84,750)
|
Conversion of common units to common shares (311,343, 140,149 and 160,160 shares in 2013, 2014 and 2015 respectively) |
0
|
|
|
3
|
3,994
|
|
|
|
(3,997)
|
|
|
|
|
|
|
|
|
Shares issued to the public (4,485,000 and 5,520,000 common shares in 2013 and 2014, respectively)(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
|
|
|
|
|
|
|
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 (1,500,000 shares in 2013 and 890,241 shares in 2015) (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 units) |
|
|
|
|
|
|
|
|
|
|
221,501
|
|
|
|
|
|
|
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars) |
|
|
|
|
|
|
|
|
|
1,369
|
$ 3,899
|
|
(2,530)
|
|
|
|
|
Exercise of share options (in units/shares) |
39,331
|
|
|
|
|
|
|
|
|
|
39,331
|
|
|
|
|
|
|
Exercise of share options (39,331, 62,888 and 76,474 shares in 2013, 2014 and 2015 respectively)(in dollars) |
$ 779
|
|
|
|
779
|
|
|
|
|
779
|
$ 779
|
|
|
|
|
|
|
Share-based compensation (105,852, 137,735 and 149,353 shares issued in 2013, 2014 and 2015) |
$ 7,605
|
|
|
2
|
7,603
|
|
|
|
|
7,605
|
$ 7,605
|
|
|
|
|
|
|
Share-based compensation (in shares/units) |
105,852
|
|
|
|
|
|
|
|
|
|
105,852
|
|
|
|
|
|
|
Redemptions of vested equity awards |
$ (2,002)
|
|
|
|
(2,002)
|
|
|
|
|
(2,002)
|
$ (2,002)
|
|
|
|
|
|
|
Contributions from noncontrolling interests |
0
|
|
|
|
(744)
|
|
|
|
744
|
|
|
|
|
|
|
|
|
Comprehensive income |
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 in other consolidates entities |
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 loss from share-based compensation |
$ (122)
|
|
|
|
(122)
|
|
|
|
|
(122)
|
$ (122)
|
|
|
|
|
|
|
Balance (preferred units) at Dec. 31, 2013 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
|
9,431,667
|
Balance (in units/ shares) at Dec. 31, 2013 |
87,394,512
|
|
|
|
|
|
|
|
|
|
91,372,212
|
|
|
|
|
|
|
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
|
Increase (Decrease) in Shareholders' Equity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Redemption of preferred shares/units |
|
|
(2,000,000)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(2,000,000)
|
Redemption of preferred shares/units (3,390,000 and 2,000,000 shares in 2013 and 2014, respectively) |
(50,000)
|
|
$ (50,000)
|
|
1,769
|
|
(1,769)
|
|
|
(50,000)
|
|
|
|
|
|
|
$ (50,000)
|
Conversion of common units to common shares (311,343, 140,149 and 160,160 shares in 2013, 2014 and 2015 respectively) |
0
|
|
|
2
|
1,841
|
|
|
|
(1,843)
|
|
|
|
|
|
|
|
|
Shares issued to the public (4,485,000 and 5,520,000 common shares in 2013 and 2014, respectively)(in dollars) |
$ 148,666
|
|
|
$ 55
|
148,611
|
|
|
|
|
148,666
|
$ 148,666
|
|
|
|
|
|
|
Shares issued to the public (in units/shares) |
|
|
|
5,520,000
|
|
|
|
|
|
|
5,520,000
|
|
|
|
|
|
|
Exercise of share options (in units/shares) |
62,888
|
|
|
|
|
|
|
|
|
|
62,888
|
|
|
|
|
|
|
Exercise of share options (39,331, 62,888 and 76,474 shares in 2013, 2014 and 2015 respectively)(in dollars) |
$ 1,489
|
|
|
$ 0
|
1,489
|
|
|
|
|
1,489
|
$ 1,489
|
|
|
|
|
|
|
Share-based compensation (105,852, 137,735 and 149,353 shares issued in 2013, 2014 and 2015) |
$ 7,050
|
|
|
2
|
7,048
|
|
|
|
|
7,050
|
$ 7,050
|
|
|
|
|
|
|
Share-based compensation (in shares/units) |
137,735
|
|
|
|
|
|
|
|
|
|
137,735
|
|
|
|
|
|
|
Redemptions of vested equity awards |
$ (1,554)
|
|
|
|
(1,554)
|
|
|
|
|
(1,554)
|
$ (1,554)
|
|
|
|
|
|
|
Contributions from noncontrolling interests |
0
|
|
|
|
(3,382)
|
|
|
|
3,382
|
|
|
|
|
|
|
|
|
Comprehensive income |
38,274
|
|
|
|
|
|
40,255
|
(4,777)
|
2,796
|
38,274
|
25,331
|
(4,986)
|
1,330
|
|
660
|
|
15,939
|
Dividends/Distributions |
(113,882)
|
|
|
|
|
|
(113,882)
|
|
|
(118,811)
|
(102,212)
|
|
|
|
$ (660)
|
|
$ (15,939)
|
Distributions to owners of common and preferred units in COPLP |
(4,929)
|
|
|
|
|
|
|
|
(4,929)
|
|
|
|
|
|
|
|
|
Contributions from noncontrolling interests in other consolidates entities |
3
|
|
|
|
0
|
|
|
|
3
|
3
|
|
|
3
|
|
|
|
|
Distributions to noncontrolling interests |
(1,613)
|
|
|
|
|
|
|
|
(1,613)
|
(1,613)
|
|
|
(1,613)
|
|
|
|
|
Adjustment to arrive at fair value of redeemable noncontrolling interest |
134
|
|
|
|
134
|
|
|
|
|
134
|
134
|
|
|
|
|
|
|
Tax loss from share-based compensation |
$ (3)
|
|
|
|
(3)
|
|
|
|
|
(3)
|
$ (3)
|
|
|
|
|
|
|
Balance (preferred units) at Dec. 31, 2014 |
|
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
352,000
|
7,431,667
|
7,431,667
|
Balance (in units/ shares) at Dec. 31, 2014 |
93,255,284
|
|
|
|
|
|
|
|
|
|
97,092,835
|
|
|
3,837,551
|
|
93,255,284
|
|
Balance at Dec. 31, 2014 |
$ 1,520,884
|
|
199,083
|
933
|
1,969,968
|
|
(717,264)
|
(1,297)
|
69,461
|
1,520,884
|
$ 1,305,219
|
(1,381)
|
9,163
|
|
$ 8,800
|
|
$ 199,083
|
Increase (Decrease) in Shareholders' Equity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Conversion of common units to common shares (311,343, 140,149 and 160,160 shares in 2013, 2014 and 2015 respectively) |
0
|
|
|
2
|
2,149
|
|
|
|
(2,151)
|
|
|
|
|
|
|
|
|
Issuance of common units resulting from common shares issued under at-the-market program (in units) |
|
|
|
|
|
|
|
|
|
|
890,241
|
|
|
|
|
|
|
Issuance of common units resulting from common shares issued under at-the-market program (1,500,000 shares in 2013 and 890,241 shares in 2015) (in dollars) |
$ 26,535
|
|
|
9
|
26,526
|
|
|
|
|
26,535
|
$ 26,535
|
|
|
|
|
|
|
Exercise of share options (in units/shares) |
76,474
|
|
|
|
|
|
|
|
|
|
76,474
|
|
|
|
|
|
|
Exercise of share options (39,331, 62,888 and 76,474 shares in 2013, 2014 and 2015 respectively)(in dollars) |
$ 2,008
|
|
|
|
2,008
|
|
|
|
|
2,008
|
$ 2,008
|
|
|
|
|
|
|
Share-based compensation (105,852, 137,735 and 149,353 shares issued in 2013, 2014 and 2015) |
$ 7,398
|
|
|
1
|
7,397
|
|
|
|
|
7,398
|
$ 7,398
|
|
|
|
|
|
|
Share-based compensation (in shares/units) |
149,353
|
|
|
|
|
|
|
|
|
|
149,353
|
|
|
|
|
|
|
Redemptions of vested equity awards |
$ (2,462)
|
|
|
|
(2,462)
|
|
|
|
|
(2,462)
|
$ (2,462)
|
|
|
|
|
|
|
Contributions from noncontrolling interests |
0
|
|
|
|
(682)
|
|
|
|
682
|
|
|
|
|
|
|
|
|
Comprehensive income |
185,247
|
|
|
|
|
|
178,300
|
(1,541)
|
8,488
|
185,247
|
170,488
|
(1,604)
|
1,493
|
|
660
|
|
14,210
|
Dividends/Distributions |
(118,208)
|
|
|
|
|
|
(118,208)
|
|
|
(122,914)
|
(108,044)
|
|
|
|
$ (660)
|
|
$ (14,210)
|
Distributions to owners of common and preferred units in COPLP |
(4,706)
|
|
|
|
|
|
|
|
(4,706)
|
|
|
|
|
|
|
|
|
Contributions from noncontrolling interests in other consolidates entities |
300
|
|
|
|
|
|
|
|
300
|
300
|
|
|
300
|
|
|
|
|
Distributions to noncontrolling interests |
(35)
|
|
|
|
|
|
|
|
(35)
|
(35)
|
|
|
(35)
|
|
|
|
|
Adjustment to arrive at fair value of redeemable noncontrolling interest |
116
|
|
|
|
116
|
|
|
|
|
116
|
116
|
|
|
|
|
|
|
Tax loss from share-based compensation |
$ (513)
|
|
|
|
(513)
|
|
|
|
|
(513)
|
$ (513)
|
|
|
|
|
|
|
Balance (preferred units) at Dec. 31, 2015 |
|
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
352,000
|
7,431,667
|
7,431,667.000
|
Balance (in units/ shares) at Dec. 31, 2015 |
94,531,512
|
|
|
|
|
|
|
|
|
|
98,208,903.000
|
|
|
3,677,391
|
|
94,531,512
|
|
Balance at Dec. 31, 2015 |
$ 1,616,564
|
|
$ 199,083
|
$ 945
|
$ 2,004,507
|
|
$ (657,172)
|
$ (2,838)
|
$ 72,039
|
$ 1,616,564
|
$ 1,400,745
|
$ (2,985)
|
$ 10,921
|
|
$ 8,800
|
|
$ 199,083
|