Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 2)

v3.5.0.2
Fair Value Measurements (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Liabilities:    
Interest rate derivatives $ 17,272 $ 3,160
Corporate Office Properties, L.P.    
Liabilities:    
Interest rate derivatives 17,272 $ 3,160
Fair value measurement on a recurring basis    
Assets:    
Fair Values on Measurement Date 5,250  
Liabilities:    
Deferred compensation plan liability 5,250  
Interest rate derivatives 17,272  
Liabilities 22,522  
Fair value measurement on a recurring basis | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 5,160  
Fair value measurement on a recurring basis | Other    
Assets:    
Marketable securities in deferred compensation plan 90  
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Fair Values on Measurement Date 5,250  
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 5,160  
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 90  
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2)    
Liabilities:    
Deferred compensation plan liability 5,250  
Interest rate derivatives 17,272  
Liabilities 22,522  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P.    
Liabilities:    
Interest rate derivatives 17,272  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2)    
Liabilities:    
Interest rate derivatives $ 17,272