Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Fair Value Measurements - Assets and Liabilities, Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Assets:    
Marketable securities in deferred compensation plan $ 3,019 $ 3,027
Fair value measurement on a recurring basis    
Assets:    
Other marketable securities 31  
Interest rate derivatives 77  
Total assets 3,127  
Liabilities:    
Deferred compensation plan liability 3,019  
Interest rate derivatives 7,640  
Total liabilities 10,659  
Fair value measurement on a recurring basis | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 3,005  
Fair value measurement on a recurring basis | Other    
Assets:    
Marketable securities in deferred compensation plan 14  
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Other marketable securities 31  
Interest rate derivatives 0  
Total assets 3,050  
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 3,005  
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 14  
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2)    
Assets:    
Other marketable securities 0  
Interest rate derivatives 77  
Total assets 77  
Liabilities:    
Deferred compensation plan liability 3,019  
Interest rate derivatives 7,640  
Total liabilities 10,659  
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2) | Mutual funds    
Assets:    
Marketable securities in deferred compensation plan 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:    
Other marketable securities 0  
Interest rate derivatives 0  
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  
Fair value measurement on a recurring basis | Significant Unobservable  Inputs (Level 3) | Other    
Assets:    
Marketable securities in deferred compensation plan $ 0