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Derivatives and Hedging - Notional Amounts and Fair Values (Details) - Designated as Hedging Instrument - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value    
Asset Derivatives $ 25,139 $ 34,859
Liability Derivatives 27,700 43,703
Commodity contracts    
Derivatives, Fair Value    
Total gross notional amount 0  
Commodity contracts | Other current assets    
Derivatives, Fair Value    
Asset Derivatives   83
Commodity contracts | Other accrued liabilities    
Derivatives, Fair Value    
Liability Derivatives   129
Foreign currency contracts    
Derivatives, Fair Value    
Total gross notional amount 828,000  
Foreign currency contracts | Other current assets    
Derivatives, Fair Value    
Asset Derivatives 18,667 13,231
Foreign currency contracts | Other assets    
Derivatives, Fair Value    
Asset Derivatives 6,472 21,545
Foreign currency contracts | Other accrued liabilities    
Derivatives, Fair Value    
Liability Derivatives 19,046 16,543
Foreign currency contracts | Noncurrent liabilities    
Derivatives, Fair Value    
Liability Derivatives $ 8,654 $ 27,031