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Derivatives - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Assets [Member]    
Derivatives in an Asset Position:    
Derivatives in an asset position $ 88 $ 0
Notional amount, Derivative asset 950 0
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Liabilities [Member]    
Derivatives in a Liability Position:    
Derivatives in a liability position 0 (41)
Notional amount, Derivative liability 0 2,380
Designated as Hedging Instrument [Member] | Interest Rate Swap Agreement [Member] | Other Long-Term Assets [Member]    
Derivatives in an Asset Position:    
Derivatives in an asset position 65 62
Notional amount, Derivative asset 10,000 10,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Assets [Member]    
Derivatives in an Asset Position:    
Derivatives in an asset position 8 2
Notional amount, Derivative asset 2,169 227
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Liabilities [Member]    
Derivatives in a Liability Position:    
Derivatives in a liability position (4) (237)
Notional amount, Derivative liability $ 886 $ 17,185