Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Assets and Liabilities, Measured on Recurring Basis (Details)

v3.20.2
Fair Value Measurements - Assets and Liabilities, Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets:    
Marketable securities in deferred compensation plan $ 2,672 $ 3,060
Fair value measurement on a recurring basis    
Assets:    
Total assets 2,692  
Liabilities:    
Deferred compensation plan liability 2,672  
Interest rate derivatives 10,977  
Total liabilities 13,649  
Fair value measurement on a recurring basis | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 2,652  
Mutual funds 20  
Fair value measurement on a recurring basis | Other    
Assets:    
Marketable securities in deferred compensation plan 20  
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total assets 2,692  
Liabilities:    
Deferred compensation plan liability 0  
Interest rate derivatives 0  
Total liabilities 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 2,652  
Mutual funds 20  
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 20  
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2)    
Assets:    
Total assets 0  
Liabilities:    
Deferred compensation plan liability 2,672  
Interest rate derivatives 10,977  
Total liabilities 13,649  
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2) | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 0  
Mutual funds 0  
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2) | Other    
Assets:    
Marketable securities in deferred compensation plan 0  
Fair value measurement on a recurring basis | Significant Unobservable  Inputs (Level 3)    
Assets:    
Total assets 0  
Liabilities:    
Deferred compensation plan liability 0  
Interest rate derivatives 0  
Total liabilities 0  
Fair value measurement on a recurring basis | Significant Unobservable  Inputs (Level 3) | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 0  
Mutual funds 0  
Fair value measurement on a recurring basis | Significant Unobservable  Inputs (Level 3) | Other    
Assets:    
Marketable securities in deferred compensation plan 0  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P.    
Liabilities:    
Interest rate derivatives 10,977  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Mutual funds    
Assets:    
Mutual funds 20  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Liabilities:    
Interest rate derivatives 0  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds    
Assets:    
Mutual funds 20  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2)    
Liabilities:    
Interest rate derivatives 10,977  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2) | Mutual funds    
Assets:    
Mutual funds 0  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Unobservable  Inputs (Level 3)    
Liabilities:    
Interest rate derivatives 0  
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Unobservable  Inputs (Level 3) | Mutual funds    
Assets:    
Mutual funds $ 0