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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash surrender value of life insurance policies - deferred compensation plan $ 23,784 $ 30,351
Marketable securities - other 37 113
Derivative financial instruments 101 487
Deferred compensation plan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan 23,663 26,797
Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Marketable securities - other 37 113
Derivative financial instruments 0 0
Quoted Prices in Active Markets (Level 1) | Deferred compensation plan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan 0 0
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash surrender value of life insurance policies - deferred compensation plan 23,784 30,351
Marketable securities - other 0 0
Derivative financial instruments 101 487
Significant Other Observable Inputs (Level 2) | Deferred compensation plan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan 23,663 26,797
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Marketable securities - other 0 0
Derivative financial instruments 0 0
Significant Unobservable Inputs (Level 3) | Deferred compensation plan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan $ 0 $ 0