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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments $ 25 $ 146
Derivative financial instruments 609 0
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments 25 146
Cash surrender value of life insurance policies - deferred compensation plan 29,088 36,269
Derivative financial instruments 609  
Fair Value, Measurements, Recurring | Deferred compensation plan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan 27,586 30,307
Fair Value, Measurements, Recurring | Marketable securities - other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - other 164 3,692
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments 0 0
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Derivative financial instruments 0  
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Marketable securities - other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - other 164 3,692
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments 25 146
Cash surrender value of life insurance policies - deferred compensation plan 29,088 36,269
Derivative financial instruments 609  
Fair Value, Measurements, Recurring | 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 27,586 30,307
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Marketable securities - other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - other 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments 0 0
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Derivative financial instruments 0  
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Marketable securities - other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - other $ 0 $ 0