Inventories (Schedule of Inventory, Current) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Finished goods and parts	$ 116,667	$ 129,995
Work in process	9,431	9,561
Raw materials	9,662	11,202
Inventory, Net	$ 135,760	$ 150,758