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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan $ 24,813 $ 27,313
Marketable securities - other 2 8
Liabilities:    
Derivative financial instruments   324
Deferred compensation plan    
Liabilities:    
Deferred compensation plan 19,558 23,251
Quoted Prices in Active Markets (Level 1)    
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Marketable securities - other 2 8
Liabilities:    
Derivative financial instruments   0
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 24,813 27,313
Marketable securities - other 0 0
Liabilities:    
Derivative financial instruments   324
Significant Other Observable Inputs (Level 2) | Deferred compensation plan    
Liabilities:    
Deferred compensation plan 19,558 23,251
Significant Unobservable Inputs (Level 3)    
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Marketable securities - other 0 0
Liabilities:    
Derivative financial instruments   0
Significant Unobservable Inputs (Level 3) | Deferred compensation plan    
Liabilities:    
Deferred compensation plan $ 0 $ 0