Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details 2)

v3.3.1.900
Fair Value Measurements (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Liabilities:    
Interest rate derivatives $ 3,160 $ 1,855
Fair value measurement on a recurring basis [Member]    
Assets:    
Interest rate derivatives 53 274
Assets 5,816 6,156
Liabilities:    
Deferred compensation plan liability 5,763 5,882
Interest rate derivatives 3,160 1,855
Liabilities 8,923 7,737
Fair value measurement on a recurring basis [Member] | Mutual funds [Member]    
Assets:    
Marketable securities in deferred compensation plan 5,658 5,756
Fair value measurement on a recurring basis [Member] | Other [Member]    
Assets:    
Marketable securities in deferred compensation plan 105 126
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Assets 5,763 5,882
Liabilities:    
Liabilities 0 0
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual funds [Member]    
Assets:    
Marketable securities in deferred compensation plan 5,658 5,756
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member]    
Assets:    
Marketable securities in deferred compensation plan 105 126
Fair value measurement on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Interest rate derivatives 53 274
Assets 53 274
Liabilities:    
Deferred compensation plan liability 5,763 5,882
Interest rate derivatives 3,160 1,855
Liabilities 8,923 7,737
Corporate Office Properties, L.P. [Member]    
Liabilities:    
Interest rate derivatives 3,160 1,855
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member]    
Assets:    
Interest rate derivatives 53 274
Assets 53 274
Liabilities:    
Interest rate derivatives 3,160 1,855
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Assets 0 0
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Interest rate derivatives 53 274
Assets 53 274
Liabilities:    
Interest rate derivatives $ 3,160 $ 1,855