Segments and Geographic Information (Sales and Long-Lived Assets by Geographic Area) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net sales:
Customers	$ 793,420	$ 822,345	$ 852,492
Intercompany	0	0	0
Total net sales	793,420	822,345	852,492
Long-lived assets:
Long-lived assets	256,392	272,534	277,978
United States
Net sales:
Customers	478,342	488,582	465,820
Intercompany	57,760	68,388	80,525
Total net sales	536,102	556,970	546,345
Long-lived assets:
Long-lived assets	91,834	94,206	82,702
Mexico
Net sales:
Customers	100,829	107,386	126,699
Intercompany	15,563	11,573	14,960
Total net sales	116,392	118,959	141,659
Long-lived assets:
Long-lived assets	89,963	93,573	97,960
All Other
Net sales:
Customers	214,249	226,377	259,973
Intercompany	35,407	37,612	35,058
Total net sales	249,656	263,989	295,031
Long-lived assets:
Long-lived assets	74,595	84,755	97,316
Eliminations
Net sales:
Intercompany	(108,730)	(117,573)	(130,543)
Total net sales	(108,730)	(117,573)	(130,543)
Long-lived assets:
Long-lived assets	$ 0	$ 0	$ 0