Goodwill and Intangible Assets, Net - Amortization Expense by Income Statement Caption (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 7,184	$ 6,956	$ 6,274
Cost of sales
Finite-Lived Intangible Assets [Line Items]
Amortization expense	103	184	76
Selling, general and administrative expenses
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 7,081	$ 6,772	$ 6,198