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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets:    
Derivative financial instruments $ 73 $ 0
Liabilities:    
Derivative financial instruments 0 487
Fair Value, Measurements, Recurring    
Assets:    
Derivative financial instruments 73  
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan 30,491 30,351
Liabilities:    
Derivative financial instruments   487
Fair Value, Measurements, Recurring | Deferred compensation plan    
Liabilities:    
Deferred compensation plan 26,191 26,797
Fair Value, Measurements, Recurring | Marketable securities - other    
Investments:    
Marketable securities - other 54 113
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)    
Assets:    
Derivative financial instruments 0  
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Liabilities:    
Derivative financial instruments   0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Deferred compensation plan    
Liabilities:    
Deferred compensation plan 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Marketable securities - other    
Investments:    
Marketable securities - other 54 113
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Assets:    
Derivative financial instruments 73  
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan 30,491 30,351
Liabilities:    
Derivative financial instruments   487
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Deferred compensation plan    
Liabilities:    
Deferred compensation plan 26,191 26,797
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Marketable securities - other    
Investments:    
Marketable securities - other 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Assets:    
Derivative financial instruments 0  
Investments:    
Cash surrender value of life insurance policies - deferred compensation plan 0 0
Liabilities:    
Derivative financial instruments   0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Deferred compensation plan    
Liabilities:    
Deferred compensation plan 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Marketable securities - other    
Investments:    
Marketable securities - other $ 0 $ 0