Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Properties, net:    
Operating properties, net $ 2,888,534 $ 2,751,488
Projects in development or held for future development 489,618 545,426
Total properties, net 3,378,152 3,296,914
Assets held for sale, net 0 14,339
Cash and cash equivalents 4,429 6,077
Restricted cash and marketable securities 11,445 9,069
Accounts receivable (net of allowance for doubtful accounts of $784 and $717, respectively) 33,753 26,901
Deferred rent receivable (net of allowance of $1,695 and $1,418, respectively) 98,340 95,910
Intangible assets on real estate acquisitions, net 61,477 43,854
Deferred leasing and financing costs, net 65,245 64,797
Investing receivables 52,814 52,147
Prepaid expenses and other assets 71,500 60,249
Total assets 3,777,155 3,670,257
Liabilities:    
Debt, net 1,999,622 1,920,057
Accounts payable and accrued expenses 138,214 123,035
Rents received in advance and security deposits 31,551 31,011
Dividends and distributions payable 30,174 29,862
Deferred revenue associated with operating leases 14,697 13,031
Interest rate derivatives 4,282 1,855
Other liabilities 9,990 12,105
Total liabilities 2,228,530 2,130,956
Commitments and contingencies      
Redeemable noncontrolling interest 18,895 18,417
Corporate Office Properties Trust’s shareholders’ equity:    
Preferred Shares of beneficial interest at liquidation preference ($0.01 par value; 25,000,000 shares authorized; issued and outstanding of 7,431,667 at March 31, 2015 and December 31, 2014) 199,083 199,083
Common Shares of beneficial interest 945 933
Additional paid-in capital 1,999,708 1,969,968
Cumulative distributions in excess of net income (733,459) (717,264)
Accumulated other comprehensive loss (3,947) (1,297)
Total Corporate Office Properties Trust’s shareholders’ equity 1,462,330 1,451,423
Noncontrolling interests in subsidiaries:    
Common units in COPLP 49,168 51,534
Preferred units in COPLP 8,800 8,800
Other consolidated entities 9,432 9,127
Noncontrolling interests in subsidiaries 67,400 69,461
Total equity 1,529,730 1,520,884
Total liabilities, redeemable noncontrolling interest and equity 3,777,155 3,670,257
Corporate Office Properties, L.P.    
Properties, net:    
Operating properties, net 2,888,534 2,751,488
Projects in development or held for future development 489,618 545,426
Total properties, net 3,378,152 3,296,914
Assets held for sale, net 0 14,339
Cash and cash equivalents 4,429 6,077
Restricted cash and marketable securities 5,509 3,187
Accounts receivable (net of allowance for doubtful accounts of $784 and $717, respectively) 33,753 26,901
Deferred rent receivable (net of allowance of $1,695 and $1,418, respectively) 98,340 95,910
Intangible assets on real estate acquisitions, net 61,477 43,854
Deferred leasing and financing costs, net 65,245 64,797
Investing receivables 52,814 52,147
Prepaid expenses and other assets 71,500 60,249
Total assets 3,771,219 3,664,375
Liabilities:    
Debt, net 1,999,622 1,920,057
Accounts payable and accrued expenses 138,214 123,035
Rents received in advance and security deposits 31,551 31,011
Dividends and distributions payable 30,174 29,862
Deferred revenue associated with operating leases 14,697 13,031
Interest rate derivatives 4,282 1,855
Other liabilities 4,054 6,223
Total liabilities 2,222,594 2,125,074
Commitments and contingencies      
Redeemable noncontrolling interest 18,895 18,417
Corporate Office Properties Trust’s shareholders’ equity:    
Common Shares of beneficial interest 1,316,514 1,305,219
Accumulated other comprehensive loss (4,137) (1,381)
Total Corporate Office Properties Trust’s shareholders’ equity 1,520,260 1,511,721
Noncontrolling interests in subsidiaries:    
Noncontrolling interests in subsidiaries 9,470 9,163
Total equity 1,529,730 1,520,884
Total liabilities, redeemable noncontrolling interest and equity 3,771,219 3,664,375
General Partner | Corporate Office Properties, L.P.    
Corporate Office Properties Trust’s shareholders’ equity:    
Preferred partners' capital accounts 199,083 199,083
Limited Partner | Corporate Office Properties, L.P.    
Corporate Office Properties Trust’s shareholders’ equity:    
Preferred partners' capital accounts $ 8,800 $ 8,800