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Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - Cash Flow Hedge - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest rate swap | Other Current Assets [Member]      
Derivative Liability      
Derivative Asset $ 524 $ 278  
Interest rate swap | Other Noncurrent Assets [Member]      
Derivative Liability      
Derivative Asset 835 693  
Foreign currency hedges | Other Current Liabilities [Member]      
Derivative Liability      
Derivative Liability 0 (742)  
Foreign currency hedges | Other Current Assets [Member]      
Derivative Liability      
Derivative Asset 76 0  
Designated as Hedging Instrument [Member] | Interest rate swap      
Derivative Liability      
Derivative Asset 1,359 971 $ 753
Designated as Hedging Instrument [Member] | Foreign currency hedges      
Derivatives, Fair Value [Line Items]      
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months 5    
Derivative Liability      
Derivative Liability   $ (742) $ (601)
Derivative Asset $ 76