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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan $ 26,586 $ 26,167
Marketable securities - other 2 3
Deferred compensation plan    
Liabilities:    
Deferred compensation plan 20,125 20,271
Quoted Prices in Active Markets (Level 1)    
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Marketable securities - other 2 3
Quoted Prices in Active Markets (Level 1) | Deferred compensation plan    
Liabilities:    
Deferred compensation plan 0 0
Significant Other Observable Inputs (Level 2)    
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan 26,586 26,167
Marketable securities - other 0 0
Significant Other Observable Inputs (Level 2) | Deferred compensation plan    
Liabilities:    
Deferred compensation plan 20,125 20,271
Significant Unobservable Inputs (Level 3)    
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Marketable securities - other 0 0
Significant Unobservable Inputs (Level 3) | Deferred compensation plan    
Liabilities:    
Deferred compensation plan $ 0 $ 0