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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 Income (Loss) | Noncontrolling Interests | Corporate Office Properties, L.P. | Corporate Office Properties, L.P. Common Shares | Corporate Office Properties, L.P. Accumulated Other Comprehensive Income (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: 160,160 and 87,000 shares for the nine months ended September 30, 2015 and 2016, 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 (COPT: 890,241 shares for the nine months ended September 30, 2015) | $ 26,535 |  | 9 | 26,526 |  |  |  | 26,535 | $ 26,535 |  |  |  |  |  |
Exercise of share options (in units/shares) | 76,474 |  |  |  |  |  |  |  | 76,474 |  |  |  |  |  |
Exercise of share options (COPT: 76,474 shares for the nine months ended September 30, 2015) | $ 2,008 |  | 0 | 2,008 |  |  |  | 2,008 | $ 2,008 |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (in units/shares) | 151,511 |  |  |  |  |  |  |  | 151,511 |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (COPT: 151,511 and 146,274 shares issued, net of redemptions for the nine months ended September 30, 2015 and 2016, respectively) | $ 5,600 |  | 1 | 5,599 |  |  |  | 5,600 | $ 5,600 |  |  |  |  |  |
Redemption of vested equity awards | (2,330) |  |  | (2,330) |  |  |  | (2,330) | (2,330) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  | (591) |  |  | 591 |  |  |  |  |  |  |  |
Comprehensive income (loss) | 120,044 |  |  |  | 118,936 | (4,526) | 5,634 | 120,044 | 112,507 | (4,705) | 1,090 |  | $ 495 |  | $ 10,657
Dividends / Distributions to owners of common and preferred units | (88,658) |  |  |  | (88,658) |  |  | (92,188) | (81,036) |  |  |  | $ (495) |  | $ (10,657)
Distributions to owners of common and preferred units in COPLP | (3,530) |  |  |  |  |  | (3,530) |  |  |  |  |  |  |  |
Distributions to noncontrolling interests in subsidiaries | (47) |  |  |  |  |  | (47) | (47) |  |  | (47) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | $ (599) |  |  | (599) |  |  |  | (599) | $ (599) |  |  |  |  |  |
Balance (in units/ shares) at Sep. 30, 2015 | 94,533,670 |  |  |  |  |  |  |  | 98,211,061 |  |  |  |  |  |
Balance (preferred units) at Sep. 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 7,431,667
Balance (COPT: 94,533,670 shares and 94,764,786 shares as of September 30, 2015 and 2016, respectively) at Sep. 30, 2015 | $ 1,579,907 | 199,083 | 945 | 2,002,730 | (686,986) | (5,823) | 69,958 | 1,579,907 | $ 1,367,904 | (6,086) | 10,206 |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (COPT: 160,160 and 87,000 shares for the nine months ended September 30, 2015 and 2016, respectively) | $ 0 |  | 1 | 1,166 |  |  | (1,167) |  |  |  |  |  |  |  |
Costs associated with common shares issued to the public | $ (5) |  |  | (5) |  |  |  | (5) | $ (5) |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (in units/shares) | 146,274 |  |  |  |  |  |  |  | 146,274 |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (COPT: 151,511 and 146,274 shares issued, net of redemptions for the nine months ended September 30, 2015 and 2016, respectively) | $ 6,177 |  | 2 | 6,175 |  |  |  | 6,177 | $ 6,177 |  |  |  |  |  |
Redemption of vested equity awards | (2,179) |  |  | (2,179) |  |  |  | (2,179) | (2,179) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  | (42) |  |  | 42 |  |  |  |  |  |  |  |
Comprehensive income (loss) | (26,629) |  |  |  | (13,294) | (13,476) | 141 | (26,629) | (24,903) | (14,002) | 1,124 |  | $ 495 |  | $ 10,657
Dividends / Distributions to owners of common and preferred units | (88,796) |  |  |  | (88,796) |  |  | (92,294) | (81,142) |  |  |  | $ (495) |  | $ (10,657)
Distributions to owners of common and preferred units in COPLP | (3,498) |  |  |  |  |  | (3,498) |  |  |  |  |  |  |  |
Distributions to noncontrolling interests in subsidiaries | (12) |  |  |  |  |  | (12) | (12) |  |  | (12) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | (516) |  |  | (516) |  |  |  | (516) | (516) |  |  |  |  |  |
Tax loss from share-based compensation | $ (319) |  |  | (319) |  |  |  | (319) | $ (319) |  |  |  |  |  |
Balance (in units/ shares) at Sep. 30, 2016 | 94,764,786 |  |  |  |  |  |  |  | 98,355,177.000 |  |  | 3,590,391 |  | 94,764,786 |
Balance (preferred units) at Sep. 30, 2016 |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 | 7,431,667 | 7,431,667
Balance (COPT: 94,533,670 shares and 94,764,786 shares as of September 30, 2015 and 2016, respectively) at Sep. 30, 2016 | $ 1,500,787 | $ 199,083 | $ 948 | $ 2,008,787 | $ (759,262) | $ (16,314) | $ 67,545 | $ 1,500,787 | $ 1,297,858 | $ (16,987) | $ 12,033 |  | $ 8,800 |  | $ 199,083

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