Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Recurring Basis) (Details)

v3.20.4
Fair Value Measurements (Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Marketable securities in deferred compensation plan $ 3,027 $ 3,060
Fair value measurement on a recurring basis    
Assets:    
Other marketable securities 30  
Interest rate derivatives   23
Total assets 3,057 3,083
Liabilities:    
Deferred compensation plan liability 3,027 3,060
Interest rate derivatives 9,522 25,682
Total liabilities 12,549 28,742
Fair value measurement on a recurring basis | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 3,008 3,035
Fair value measurement on a recurring basis | Other    
Assets:    
Marketable securities in deferred compensation plan 19 25
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Other marketable securities 30  
Interest rate derivatives   0
Total assets 3,057 3,060
Liabilities:    
Deferred compensation plan liability 0 0
Interest rate derivatives 0 0
Total 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 3,008 3,035
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 19 25
Fair value measurement on a recurring basis | Significant Other Observable Inputs(Level 2)    
Assets:    
Other marketable securities 0  
Interest rate derivatives   23
Total assets 0 23
Liabilities:    
Deferred compensation plan liability 3,027 3,060
Interest rate derivatives 9,522 25,682
Total liabilities 12,549 28,742
Fair value measurement on a recurring basis | Significant Other Observable Inputs(Level 2) | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 0 0
Fair value measurement on a recurring basis | Significant Other Observable Inputs(Level 2) | Other    
Assets:    
Marketable securities in deferred compensation plan 0 0
Fair value measurement on a recurring basis | Significant Unobservable  Inputs (Level 3)    
Assets:    
Other marketable securities 0  
Interest rate derivatives   0
Total assets 0 0
Liabilities:    
Deferred compensation plan liability 0 0
Interest rate derivatives 0 0
Total liabilities 0 0
Fair value measurement on a recurring basis | Significant Unobservable  Inputs (Level 3) | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 0 0
Fair value measurement on a recurring basis | Significant Unobservable  Inputs (Level 3) | Other    
Assets:    
Marketable securities in deferred compensation plan 0 0
Corporate Office Properties, L.P | Fair value measurement on a recurring basis    
Assets:    
Other marketable securities 30  
Interest rate derivatives   23
Liabilities:    
Interest rate derivatives 9,522 25,682
Corporate Office Properties, L.P | Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Other marketable securities 30  
Interest rate derivatives   0
Liabilities:    
Interest rate derivatives 0 0
Corporate Office Properties, L.P | Fair value measurement on a recurring basis | Significant Other Observable Inputs(Level 2)    
Assets:    
Other marketable securities 0  
Interest rate derivatives   23
Liabilities:    
Interest rate derivatives 9,522 25,682
Corporate Office Properties, L.P | Fair value measurement on a recurring basis | Significant Unobservable  Inputs (Level 3)    
Assets:    
Other marketable securities 0  
Interest rate derivatives   0
Liabilities:    
Interest rate derivatives $ 0 $ 0