Goodwill and Intangible Assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Total	$ 391,074	$ 382,416	$ 404,475
Cost of sales
Finite-Lived Intangible Assets [Line Items]
Total	3,558	3,174	2,963
Selling, general and administrative expenses
Finite-Lived Intangible Assets [Line Items]
Total	3,955	3,835	4,048
Amortization of acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Total	$ 383,561	$ 375,407	$ 397,464