Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details 2)

v2.4.0.8
Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Liabilities:        
Interest rate derivatives $ 3,309 $ 6,185    
Redeemable noncontrolling interest 17,758 10,298 8,908 9,000
Corporate Office Properties, L.P.
        
Liabilities:        
Interest rate derivatives 3,309 6,185    
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
        
Assets:        
Common stocks 298 [1] 809 [1]    
Assets 7,765 7,585    
Liabilities:        
Liabilities 0 0    
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds
        
Assets:        
Marketable securities in deferred compensation plan 7,090 [1] 6,275 [1]    
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Shares
        
Assets:        
Marketable securities in deferred compensation plan 176 [1] 298 [1]    
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
        
Assets:        
Marketable securities in deferred compensation plan 201 [1] 203 [1]    
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2)
        
Assets:        
Interest rate derivative 6,594 [2]      
Warrants to purchase common shares in KEYW 301 [2] 294 [2]    
Assets 6,895 [2] 294    
Liabilities:        
Deferred compensation plan liability 7,467 [3] 6,776 [3]    
Interest rate derivatives 3,309 6,185    
Liabilities 10,776 12,961    
Fair value measurement on a recurring basis | Significant Unobservable Inputs (Level 3)
        
Liabilities:        
Redeemable noncontrolling interest 17,758 10,298    
Fair value measurement on a recurring basis | Total Estimated Fair Value
        
Assets:        
Common stocks 298 [1] 809 [1]    
Interest rate derivative 6,594 [2]      
Warrants to purchase common shares in KEYW 301 [2] 294 [2]    
Assets 14,660 7,879    
Liabilities:        
Deferred compensation plan liability 7,467 [3] 6,776 [3]    
Interest rate derivatives 3,309 6,185    
Liabilities 10,776 12,961    
Redeemable noncontrolling interest 17,758 10,298    
Fair value measurement on a recurring basis | Total Estimated Fair Value | Mutual funds
        
Assets:        
Marketable securities in deferred compensation plan 7,090 [1] 6,275 [1]    
Fair value measurement on a recurring basis | Total Estimated Fair Value | Common Shares
        
Assets:        
Marketable securities in deferred compensation plan 176 [1] 298 [1]    
Fair value measurement on a recurring basis | Total Estimated Fair Value | Other
        
Assets:        
Marketable securities in deferred compensation plan 201 [1] 203 [1]    
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Quoted Prices in Active Markets for Identical Assets (Level 1)
        
Assets:        
Common stocks 298 [4] 809 [4]    
Assets 298 809    
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2)
        
Assets:        
Interest rate derivative 6,594 [5]      
Warrants to purchase common shares in KEYW 301 [5] 294 [5]    
Assets 6,895 294    
Liabilities:        
Interest rate derivatives 3,309 6,185    
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Unobservable Inputs (Level 3)
        
Assets:        
Assets   0    
Liabilities:        
Redeemable noncontrolling interest   10,298    
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Total Estimated Fair Value
        
Assets:        
Common stocks 298 [4] 809 [4]    
Interest rate derivative 6,594 [5]      
Warrants to purchase common shares in KEYW 301 [5] 294 [5]    
Assets 7,193 1,103    
Liabilities:        
Interest rate derivatives   6,185    
Redeemable noncontrolling interest   $ 10,298    
[1] Included in the line entitled “restricted cash and marketable securities” on COPT’s consolidated balance sheet.
[2] Included in the line entitled “prepaid expenses and other assets” on COPT’s consolidated balance sheet.
[3] Included in the line entitled “other liabilities” on COPT’s consolidated balance sheet.
[4] Included in the line entitled “restricted cash and marketable securities” on COPLP’s consolidated balance sheet.
[5] Included in the line entitled “prepaid expenses and other assets” on COPLP’s consolidated balance sheet.