Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 2)

v3.4.0.3
Fair Value Measurements (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Liabilities:    
Interest rate derivatives $ 15,072 $ 3,160
Corporate Office Properties, L.P.    
Liabilities:    
Interest rate derivatives 15,072 $ 3,160
Fair value measurement on a recurring basis    
Assets:    
Assets 5,671  
Liabilities:    
Deferred compensation plan liability 5,671  
Interest rate derivatives 15,072  
Liabilities 20,743  
Fair value measurement on a recurring basis | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 5,580  
Fair value measurement on a recurring basis | Other    
Assets:    
Marketable securities in deferred compensation plan 91  
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Assets 5,671  
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 5,580  
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 91  
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2)    
Assets:    
Assets 0  
Liabilities:    
Deferred compensation plan liability 5,671  
Interest rate derivatives 15,072  
Liabilities 20,743  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P.    
Liabilities:    
Interest rate derivatives 15,072  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2)    
Liabilities:    
Interest rate derivatives $ 15,072