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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Class of Warrant or Right [Line Items]      
Advertising costs $ 1,300 $ 1,100 $ 1,100
Cost of sales $ 538,437 530,083 487,247
Maturity of foreign currency exchange contracts 9 months    
Dividend Rate | Performance-based warrants      
Class of Warrant or Right [Line Items]      
Risk-free interest rate 0.00    
Shipping and Handling      
Class of Warrant or Right [Line Items]      
Cost of sales $ 12,200 $ 12,200 $ 11,600