Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies 2 (Details)

v2.4.0.6
Summary of Significant Accounting Policies 2 (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Redeemable noncontrolling interest $ 10,356 $ 9,237 $ 10,298  
Preferred Shares, reported at par value   0    
Preferred Shares, reported at liquidation value 333,833 216,333 333,833  
Additional paid-in capital 1,772,255 1,451,981 1,653,672  
Cumulative distributions in excess of net income (632,134) (547,591) (617,455)  
Noncontrolling interests in common units in the Operating Partnership 50,604 53,999 52,122  
Noncontrolling interest in other consolidated entities 10,737 9,518 10,153  
Total equity 1,540,543 1,191,559 1,436,499 1,205,899
Total liabilities, redeemable noncontrolling interest and equity 3,685,099 3,797,368 3,653,759  
Revenues 130,997 132,195    
Expenses        
Property operating expenses 42,575 41,253    
Depreciation and amortization associated with real estate operations 28,252 27,834    
Construction contract and other service expenses 13,477 20,607    
Impairment losses (recoveries) 1,857 (4,836)    
General, administrative and leasing expenses   9,569    
Business development expenses and land carry costs 1,359 1,576    
Total operating expenses 95,340 96,003    
Operating income 35,657 36,192    
Interest expense (22,307) (24,431)    
Income tax (expense) benefit (16) (204)    
Income from continuing operations 9,137 12,685    
Discontinued operations 3,786 (2,450)    
Net income 15,277 10,235    
Net income attributable to noncontrolling interests in common units in the Operating Partnership (429) (373)    
Net income attributable to noncontrolling interests in other consolidated entities 337 598    
Net income attributable to Corporate Office Properties Trust 15,020 10,295    
Basic and diluted earnings per common share:        
Income from continuing operations (in dollars per share)   $ 0.12    
Income from discontinued operations (in dollars per share)   $ (0.03)    
Net income attributable to COPT common shareholders (in dollars per share)   $ 0.09    
Scenario, Previously Reported
        
Redeemable noncontrolling interest   0    
Preferred Shares, reported at par value   81    
Preferred Shares, reported at liquidation value   0    
Additional paid-in capital   1,670,451    
Cumulative distributions in excess of net income   (549,456)    
Noncontrolling interests in common units in the Operating Partnership   53,883    
Noncontrolling interest in other consolidated entities   18,518    
Total equity   1,200,796    
Total liabilities, redeemable noncontrolling interest and equity   3,797,368    
Revenues   143,473    
Expenses        
Property operating expenses   47,202    
Depreciation and amortization associated with real estate operations   31,066    
Construction contract and other service expenses   20,607    
Impairment losses (recoveries)   5,126    
General, administrative and leasing expenses   7,017    
Business development expenses and land carry costs   1,594    
Total operating expenses   112,612    
Operating income   30,861    
Interest expense   (25,224)    
Income tax (expense) benefit   (4,173)    
Income from continuing operations   2,592    
Discontinued operations   4,385    
Net income   6,977    
Net income attributable to noncontrolling interests in common units in the Operating Partnership   (159)    
Net income attributable to noncontrolling interests in other consolidated entities   24    
Net income attributable to Corporate Office Properties Trust   6,677    
Basic and diluted earnings per common share:        
Income from continuing operations (in dollars per share)   $ (0.02)    
Income from discontinued operations (in dollars per share)   $ 0.06    
Net income attributable to COPT common shareholders (in dollars per share)   $ 0.04    
Change
        
Redeemable noncontrolling interest   9,237    
Preferred Shares, reported at par value   (81)    
Preferred Shares, reported at liquidation value   216,333    
Additional paid-in capital   (218,470)    
Cumulative distributions in excess of net income   1,865    
Noncontrolling interests in common units in the Operating Partnership   116    
Noncontrolling interest in other consolidated entities   (9,000)    
Total equity   (9,237)    
Revenues   (11,278)    
Expenses        
Property operating expenses   (5,949)    
Depreciation and amortization associated with real estate operations   (3,232)    
Impairment losses (recoveries)   (9,962)    
General, administrative and leasing expenses   2,552    
Business development expenses and land carry costs   (18)    
Total operating expenses   (16,609)    
Operating income   5,331    
Interest expense   793    
Income tax (expense) benefit   3,969    
Income from continuing operations   10,093    
Discontinued operations   (6,835)    
Net income   3,258    
Net income attributable to noncontrolling interests in common units in the Operating Partnership   (214)    
Net income attributable to noncontrolling interests in other consolidated entities   574    
Net income attributable to Corporate Office Properties Trust   3,618    
Basic and diluted earnings per common share:        
Income from continuing operations (in dollars per share)   $ 0.14    
Income from discontinued operations (in dollars per share)   $ (0.09)    
Net income attributable to COPT common shareholders (in dollars per share)   $ 0.05    
Reclassifications
        
Preferred Shares, reported at par value   (81)    
Preferred Shares, reported at liquidation value   216,333    
Additional paid-in capital   (216,252)    
Revisions
        
Redeemable noncontrolling interest   9,237    
Additional paid-in capital   (2,218)    
Cumulative distributions in excess of net income   1,865    
Noncontrolling interests in common units in the Operating Partnership   116    
Noncontrolling interest in other consolidated entities   (9,000)    
Total equity   (9,237)    
Continuing Operations | Reclassifications
        
Expenses        
Property operating expenses   (1,841)    
General, administrative and leasing expenses   1,841    
Continuing Operations | Revisions
        
Expenses        
General, administrative and leasing expenses   711    
Total operating expenses   711    
Operating income   (711)    
Income tax (expense) benefit   3,969    
Income from continuing operations   3,258    
Net income   3,258    
Net income attributable to noncontrolling interests in common units in the Operating Partnership   (214)    
Net income attributable to noncontrolling interests in other consolidated entities   574    
Net income attributable to Corporate Office Properties Trust   3,618    
Basic and diluted earnings per common share:        
Income from continuing operations (in dollars per share)   $ 0.05    
Net income attributable to COPT common shareholders (in dollars per share)   $ 0.05    
Discontinued Operations | Reclassifications
        
Revenues   (11,278)    
Expenses        
Property operating expenses   (4,108)    
Depreciation and amortization associated with real estate operations   (3,232)    
Impairment losses (recoveries)   (9,962)    
Business development expenses and land carry costs   (18)    
Total operating expenses   (17,320)    
Operating income   6,042    
Interest expense   793    
Income from continuing operations   6,835    
Discontinued operations   $ (6,835)    
Basic and diluted earnings per common share:        
Income from continuing operations (in dollars per share)   $ 0.09    
Income from discontinued operations (in dollars per share)   $ (0.09)