Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 44,583	$ 46,789
Work-in-process	32,629	28,386
Finished products	4,778	3,332
Total inventories	81,990	78,507
Less reserves	(3,179)	(3,479)
Total inventories, net	$ 78,811	$ 75,028