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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

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