Inventories, net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Inventories
Raw materials	$ 63,319	$ 72,244
Work-in-process	19,975	15,877
Finished products	9,205	24,364
Total inventories	92,499	112,485
Less reserves	(2,314)	(2,410)	(2,012)	(2,096)
Total inventories, net	$ 90,185	$ 110,075