Fixed Assets (Schedule of Depreciation and Amortization of Fixed Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Cost of sales	$ 22,993	$ 21,289	$ 16,364
Selling, general and administrative expenses	5,140	4,137	3,440
Total	$ 28,133	$ 25,426	$ 19,804