Property and Equipment, Net (Schedule of Depreciation and Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 15,001	$ 15,067	$ 16,297
Cost of Sales [Member]
Property, Plant and Equipment [Line Items]
Depreciation	2,278	1,755	1,764
Selling, General and Administrative Expenses [Member]
Property, Plant and Equipment [Line Items]
Depreciation	$ 12,723	$ 13,312	$ 14,533