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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Preferred Shares | Common Shares | Additional Paid-in Capital | Cumulative Distributions in Excess of Net Income | Accumulated Other Comprehensive Loss | Noncontrolling Interests | Corporate Office Properties, L.P. | Corporate Office Properties, L.P. Common Shares | Corporate Office Properties, L.P. Accumulated Other Comprehensive Loss | Corporate Office Properties, L.P. Noncontrolling Interests | Corporate Office Properties, L.P. Limited Partner | Corporate Office Properties, L.P. Limited Partner Preferred Shares | Corporate Office Properties, L.P. General Partner | Corporate Office Properties, L.P. General Partner Preferred Shares
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (COPT: 93,255,284 shares and 94,531,512 shares as of December 31, 2014 and 2015, respectively) 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
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 |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (COPT: 158,000 shares for the three months ended March 31, 2015) | $ 0 |  | 2 | 2,120 |  |  | (2,122) |  |  |  |  |  |  |  |
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 (COPT: 890,241 shares for the three months ended March 31, 2015) | $ 26,535 |  | 9 | 26,526 |  |  |  | 26,535 | $ 26,535 |  |  |  |  |  |
Exercise of share options (in units/shares) | 70,374 |  |  |  |  |  |  |  | 70,374 |  |  |  |  |  |
Exercise of share options (COPT: 70,374 shares for the three months ended March 31, 2015) | $ 1,845 |  | 0 | 1,845 |  |  |  | 1,845 | $ 1,845 |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (in units/shares) | 162,370 |  |  |  |  |  |  |  | 162,370 |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (COPT: 162,370 and 129,869 shares issued, net of redemptions for the three months ended March 31, 2015 and 2016, respectively) | $ 1,829 |  | 1 | 1,828 |  |  |  | 1,829 | $ 1,829 |  |  |  |  |  |
Redemption of vested equity awards | (2,031) |  |  | (2,031) |  |  |  | (2,031) | (2,031) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  | (475) |  |  | 475 |  |  |  |  |  |  |  |
Comprehensive income | 11,472 |  |  |  | 13,355 | (2,650) | 767 | 11,472 | 10,200 | (2,756) | 311 |  | $ 165 |  | $ 3,552
Dividends / Distributions to owners of common and preferred units | (29,550) |  |  |  | (29,550) |  |  | (30,727) | (27,010) |  |  |  | $ (165) |  | $ (3,552)
Distributions to owners of common and preferred units in COPLP | (1,177) |  |  |  |  |  | (1,177) |  |  |  |  |  |  |  |
Distributions to noncontrolling interests in subsidiaries | (4) |  |  |  |  |  | (4) | (4) |  |  | (4) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | $ (73) |  |  | (73) |  |  |  | (73) | $ (73) |  |  |  |  |  |
Balance (in units/ shares) at Mar. 31, 2015 | 94,536,269 |  |  |  |  |  |  |  | 98,215,820 |  |  |  |  |  |
Balance (preferred units) at Mar. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 7,431,667
Balance (COPT: 94,536,269 shares and 94,661,381 shares as of March 31, 2015 and 2016, respectively) at Mar. 31, 2015 | $ 1,529,730 | 199,083 | 945 | 1,999,708 | (733,459) | (3,947) | 67,400 | 1,529,730 | $ 1,316,514 | (4,137) | 9,470 |  | $ 8,800 |  | $ 199,083
Balance (COPT: 93,255,284 shares and 94,531,512 shares as of December 31, 2014 and 2015, respectively) 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
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 |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs associated with common shares issued to the public | $ (5) |  |  | (5) |  |  |  | (5) | $ (5) |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (in units/shares) | 129,869 |  |  |  |  |  |  |  | 129,869 |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (COPT: 162,370 and 129,869 shares issued, net of redemptions for the three months ended March 31, 2015 and 2016, respectively) | $ 2,425 |  | 2 | 2,423 |  |  |  | 2,425 | $ 2,425 |  |  |  |  |  |
Redemption of vested equity awards | (1,154) |  |  | (1,154) |  |  |  | (1,154) | (1,154) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  | 54 |  |  | (54) |  |  |  |  |  |  |  |
Comprehensive income | (2,878) |  |  |  | 6,826 | (10,024) | 320 | (2,878) | 3,400 | (10,414) | 419 |  | $ 165 |  | $ 3,552
Dividends / Distributions to owners of common and preferred units | (29,589) |  |  |  | (29,589) |  |  | (30,765) | (27,048) |  |  |  | $ (165) |  | $ (3,552)
Distributions to owners of common and preferred units in COPLP | (1,176) |  |  |  |  |  | (1,176) |  |  |  |  |  |  |  |
Distributions to noncontrolling interests in subsidiaries | (4) |  |  |  |  |  | (4) | (4) |  |  | (4) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | $ (302) |  |  | (302) |  |  |  | (302) | $ (302) |  |  |  |  |  |
Balance (in units/ shares) at Mar. 31, 2016 | 94,661,381 |  |  |  |  |  |  |  | 98,338,772.000 |  |  | 3,677,391 |  | 94,661,381 |
Balance (preferred units) at Mar. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 | 7,431,667 | 7,431,667
Balance (COPT: 94,536,269 shares and 94,661,381 shares as of March 31, 2015 and 2016, respectively) at Mar. 31, 2016 | $ 1,583,881 | $ 199,083 | $ 947 | $ 2,005,523 | $ (679,935) | $ (12,862) | $ 71,125 | $ 1,583,881 | $ 1,378,061 | $ (13,399) | $ 11,336 |  | $ 8,800 |  | $ 199,083

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