Goodwill and Intangible Assets, Net (Schedule of Intangible Asset Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 18,129	$ 18,976	$ 19,696
Cost of Sales [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	4,550	5,127	5,848
Selling, General and Administrative Expenses [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 13,579	$ 13,849	$ 13,848