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Fair Value Measurements - Financial Assets and (Liabilities) Carried at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate contracts $ 0 $ 0
Foreign currency contract liabilities, current and long-term 0 0
Foreign currency contract liabilities, current and long-term 0 0
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate contracts 7,657 5,749
Foreign currency contract liabilities, current and long-term 1,095 621
Foreign currency contract liabilities, current and long-term (1,059) (1,391)
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate contracts 0 0
Foreign currency contract liabilities, current and long-term 0 0
Foreign currency contract liabilities, current and long-term 0 0
Estimate of Fair Value, Fair Value Disclosure    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate contracts 7,657 5,749
Foreign currency contract liabilities, current and long-term 1,095 621
Foreign currency contract liabilities, current and long-term $ (1,059) $ (1,391)