Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 732,677	$ 727,946	$ 745,447
Property, plant and equipment, net	227,403	234,646
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	120,395	177,198	261,478
Property, plant and equipment, net	37,795	44,274
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	612,282	550,748	$ 483,969
Property, plant and equipment, net	$ 189,608	$ 190,372