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v2.3.0.11

Shareholders' Equity (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2011 | Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Common Shares |  |  |  |  |
Common shares issued to the public (in shares) | 4,600,000 |  |  | 4,600,000 |
Per share value of common shares issued to the public (in dollars per share) | $ 33.00 |  |  |  |
Net proceeds from issue of shares after underwriter discounts but before offering expenses | $ 145,700,000 |  |  |  |
Number of operating partnership units converted into common shares (in units) |  |  |  | 21,045 | 610,598
Number of common shares for each converted common unit (in shares) |  |  |  | 1 |
Dividends declared per common share (in dollars per share) |  | $ 0.4125 | $ 0.3925 | $ 0.825 | $ 0.785
Accumulated other comprehensive loss activity |  |  |  |  |
Beginning balance |  |  |  | (4,163,000) | (1,907,000)
Amount of loss recognized in AOCL (effective portion) |  | (8,458,000) | (1,929,000) | (8,594,000) | (4,314,000)
Amount of loss reclassified from AOCL to income (effective portion) |  | 1,163,000 | 886,000 | 2,267,000 | 1,797,000
Adjustment to AOCL attributable to noncontrolling interests |  |  |  | 866,000 | 161,000
Ending balance |  | (9,624,000) | (4,263,000) | (9,624,000) | (4,263,000)
Comprehensive income |  |  |  |  |
Net (loss) income |  | (26,007,000) | 9,151,000 | (44,573,000) | 19,826,000
Amount of loss recognized in AOCL (effective portion) |  | (8,458,000) | (1,929,000) | (8,594,000) | (4,314,000)
Amount of loss reclassified from AOCL to income (effective portion) |  | 1,163,000 | 886,000 | 2,267,000 | 1,797,000
Total comprehensive (loss) income |  | (33,302,000) | 8,108,000 | (50,900,000) | 17,309,000
Net loss (income) attributable to noncontrolling interests |  | 1,783,000 | (685,000) | 2,559,000 | (1,422,000)
Other comprehensive loss attributable to noncontrolling interests |  | 450,000 | 77,000 | 388,000 | 198,000
Total comprehensive (loss) income attributable to COPT |  | $ (31,069,000) | $ 7,500,000 | $ (47,953,000) | $ 16,085,000

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