Consolidated Statements of Equity - USD ($) $ in Thousands |
Total |
Preferred Shares [Member] |
Common Shares [Member] |
Additional Paid-in Capital [Member] |
Cumulative Distributions in Excess of Net Income [Member] |
Accumulated Other Comprehensive Income (Loss) [Member] |
Noncontrolling Interests [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 [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, 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
|
|
|
|
|
|
|
Balance (preferred units) at Dec. 31, 2013 |
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
|
9,431,667
|
Increase (Decrease) in Shareholders' Equity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Redemption of preferred shares/units |
|
(2,000,000)
|
|
|
|
|
|
|
|
|
|
|
|
|
(2,000,000)
|
Redemption of preferred shares/units (2,000,000 shares in 2014 and 531,667 shares in 2016, respectively) |
$ (50,000)
|
$ (50,000)
|
|
1,769
|
(1,769)
|
|
|
(50,000)
|
|
|
|
|
|
|
$ (50,000)
|
Conversion of common units to common shares (140,149, 160,160 and 87,000 shares in 2014, 2015 and 2016 respectively) |
0
|
|
2
|
1,841
|
|
|
(1,843)
|
|
|
|
|
|
|
|
|
Shares issued to the public (5,520,000 common shares in 2014, respectively) |
$ 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 (62,888, 76,474 and shares in 2014 and 2015 respectively) |
$ 1,489
|
|
|
1,489
|
|
|
|
1,489
|
$ 1,489
|
|
|
|
|
|
|
Share-based compensation (137,735, 149,353 and 158,912 shares issued, net of redemptions in 2014, 2015 and 2016 respectively) |
$ 7,050
|
|
$ 2
|
7,048
|
|
|
|
7,050
|
$ 7,050
|
|
|
|
|
|
|
Share-based compensation (in shares/units) |
137,735
|
|
|
|
|
|
|
|
137,735
|
|
|
|
|
|
|
Redemption of vested equity awards |
$ (1,554)
|
|
|
(1,554)
|
|
|
|
(1,554)
|
$ (1,554)
|
|
|
|
|
|
|
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |
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 consolidated entities |
3
|
|
|
|
|
|
3
|
3
|
|
|
3
|
|
|
|
|
Distributions to noncontrolling interests in other consolidated entities |
(1,613)
|
|
|
|
|
|
(1,613)
|
(1,613)
|
|
|
(1,613)
|
|
|
|
|
Adjustment to arrive at fair value of redeemable noncontrolling interests |
134
|
|
|
134
|
|
|
|
134
|
134
|
|
|
|
|
|
|
Tax loss from share-based compensation |
$ (3)
|
|
|
(3)
|
|
|
|
(3)
|
$ (3)
|
|
|
|
|
|
|
Balance (preferred units) at Dec. 31, 2014 |
|
|
|
|
|
|
|
|
|
|
|
|
352,000
|
|
7,431,667
|
Balance (in units/ shares) at Dec. 31, 2014 |
93,255,284
|
|
|
|
|
|
|
|
97,092,835
|
|
|
|
|
|
|
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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Redemption of preferred shares/units |
|
0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Conversion of common units to common shares (140,149, 160,160 and 87,000 shares in 2014, 2015 and 2016 respectively) |
0
|
|
$ 2
|
2,149
|
|
|
(2,151)
|
|
|
|
|
|
|
|
|
Shares issued to the public (in units/shares) |
|
|
0
|
|
|
|
|
|
|
|
|
|
|
|
|
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 (890,241 shares in 2015 and 3,721,227 shares in 2016) |
$ 26,535
|
|
$ 9
|
26,526
|
|
|
|
26,535
|
$ 26,535
|
|
|
|
|
|
|
Exercise of share options (in units/shares) |
76,474
|
|
|
|
|
|
|
|
76,474
|
|
|
|
|
|
|
Exercise of share options (62,888, 76,474 and shares in 2014 and 2015 respectively) |
$ 2,008
|
|
|
2,008
|
|
|
|
2,008
|
$ 2,008
|
|
|
|
|
|
|
Share-based compensation (137,735, 149,353 and 158,912 shares issued, net of redemptions in 2014, 2015 and 2016 respectively) |
$ 7,398
|
|
1
|
7,397
|
|
|
|
7,398
|
$ 7,398
|
|
|
|
|
|
|
Share-based compensation (in shares/units) |
149,353
|
|
|
|
|
|
|
|
149,353
|
|
|
|
|
|
|
Redemption of vested equity awards |
$ (2,462)
|
|
|
(2,462)
|
|
|
|
(2,462)
|
$ (2,462)
|
|
|
|
|
|
|
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |
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 consolidated entities |
300
|
|
|
|
|
|
300
|
300
|
|
|
300
|
|
|
|
|
Distributions to noncontrolling interests in other consolidated entities |
(35)
|
|
|
|
|
|
(35)
|
(35)
|
|
|
(35)
|
|
|
|
|
Adjustment to arrive at fair value of redeemable noncontrolling interests |
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
|
Balance (in units/ shares) at Dec. 31, 2015 |
94,531,512
|
|
|
|
|
|
|
|
98,208,903
|
|
|
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
|
Increase (Decrease) in Shareholders' Equity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Redemption of preferred shares/units |
|
(531,667)
|
|
|
|
|
|
|
|
|
|
|
|
|
(531,667)
|
Redemption of preferred shares/units (2,000,000 shares in 2014 and 531,667 shares in 2016, respectively) |
(26,583)
|
$ (26,583)
|
|
17
|
(17)
|
|
|
26,583
|
|
|
|
|
|
|
$ (26,583)
|
Conversion of common units to common shares (140,149, 160,160 and 87,000 shares in 2014, 2015 and 2016 respectively) |
0
|
|
1
|
1,166
|
|
|
(1,167)
|
|
|
|
|
|
|
|
|
Issuance of common units resulting from common shares issued under at-the-market program (in units) |
|
|
|
|
|
|
|
|
3,721,227
|
|
|
|
|
|
|
Issuance of common units resulting from common shares issued under at-the-market program (890,241 shares in 2015 and 3,721,227 shares in 2016) |
109,053
|
|
37
|
109,016
|
|
|
|
109,053
|
$ 109,053
|
|
|
|
|
|
|
Share-based compensation (137,735, 149,353 and 158,912 shares issued, net of redemptions in 2014, 2015 and 2016 respectively) |
$ 7,453
|
|
2
|
7,451
|
|
|
|
7,453
|
$ 7,453
|
|
|
|
|
|
|
Share-based compensation (in shares/units) |
158,912
|
|
|
|
|
|
|
|
158,912
|
|
|
|
|
|
|
Redemption of vested equity awards |
$ (2,466)
|
|
|
(2,466)
|
|
|
|
(2,466)
|
$ (2,466)
|
|
|
|
|
|
|
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |
0
|
|
|
(2,158)
|
|
|
2,158
|
|
|
|
|
|
|
|
|
Comprehensive income |
14,543
|
|
|
|
11,439
|
1,107
|
1,997
|
14,543
|
(3,017)
|
1,131
|
1,472
|
|
660
|
|
14,297
|
Dividends/Distributions |
(119,526)
|
|
|
|
(119,526)
|
|
|
(124,176)
|
(109,219)
|
|
|
|
$ (660)
|
|
$ (14,297)
|
Distributions to owners of common and preferred units in COPLP |
(4,650)
|
|
|
|
|
|
(4,650)
|
|
|
|
|
|
|
|
|
Contributions from noncontrolling interests in other consolidated entities |
1,244
|
|
|
|
|
|
1,244
|
1,244
|
|
|
1,244
|
|
|
|
|
Distributions to noncontrolling interests in other consolidated entities |
(16)
|
|
|
|
|
|
(16)
|
(16)
|
|
|
(16)
|
|
|
|
|
Adjustment to arrive at fair value of redeemable noncontrolling interests |
(621)
|
|
|
(621)
|
|
|
|
(621)
|
(621)
|
|
|
|
|
|
|
Tax loss from share-based compensation |
$ (331)
|
|
|
(331)
|
|
|
|
(331)
|
$ (331)
|
|
|
|
|
|
|
Balance (preferred units) at Dec. 31, 2016 |
|
|
|
|
|
|
|
|
|
|
|
352,000
|
352,000
|
6,900,000
|
6,900,000
|
Balance (in units/ shares) at Dec. 31, 2016 |
98,498,651
|
|
|
|
|
|
|
|
102,089,042.000
|
|
|
3,590,391
|
|
98,498,651
|
|
Balance at Dec. 31, 2016 |
$ 1,594,664
|
$ 172,500
|
$ 985
|
$ 2,116,581
|
$ (765,276)
|
$ (1,731)
|
$ 71,605
|
$ 1,594,664
|
$ 1,401,597
|
$ (1,854)
|
$ 13,621
|
|
$ 8,800
|
|
$ 172,500
|