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Shareholders' Equity (Details) (USD $)
1 Months Ended3 Months Ended9 Months Ended
May 31, 2011
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Common Shares     
Common shares issued to the public (in shares)4,600,000  4,600,000 
Per share value of common shares issued to the public (in dollars per share)$ 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)   83,506620,598
Number of common shares for each converted common unit (in shares)   1 
Dividends declared per common share (in dollars per share) $ 0.4125$ 0.4125$ 1.2375$ 1.1975
Accumulated other comprehensive loss activity     
Beginning balance   (4,163,000)(1,907,000)
Amount of loss recognized in AOCL (effective portion) (21,869,000)(1,530,000)(30,463,000)(5,844,000)
Amount of loss reclassified from AOCL to income (effective portion) 1,179,000887,0003,446,0002,684,000
Adjustment to AOCL attributable to noncontrolling interests   2,562,000206,000
Ending balance (28,618,000)(4,861,000)(28,618,000)(4,861,000)
Comprehensive income     
Net income (loss) 7,470,0008,926,000(37,103,000)28,752,000
Amount of loss recognized in AOCL (effective portion) (21,869,000)(1,530,000)(30,463,000)(5,844,000)
Amount of loss reclassified from AOCL to income (effective portion) 1,179,000887,0003,446,0002,684,000
Total comprehensive (loss) income (13,220,000)8,283,000(64,120,000)25,592,000
Net (income) loss attributable to noncontrolling interests (904,000)(94,000)1,655,000(1,516,000)
Other comprehensive loss attributable to noncontrolling interests 1,206,00047,0001,594,000245,000
Total comprehensive (loss) income attributable to COPT $ (12,918,000)$ 8,236,000$ (60,871,000)$ 24,321,000