Segments and Geographic Information (Sales and Long-Lived Assets by Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net sales:
Customers					$ 822,345	$ 852,492	$ 818,811
Intercompany					0	0	0
Total net sales	$ 219,145	$ 201,784	$ 214,051	$ 187,365	822,345	852,492	818,811
Long-lived assets:
Long-lived assets	272,534				272,534	277,978	265,662
United States
Net sales:
Customers					488,582	465,820	444,176
Intercompany					68,388	80,525	51,521
Total net sales					556,970	546,345	495,697
Long-lived assets:
Long-lived assets	94,206				94,206	82,702	68,114
Mexico
Net sales:
Customers					107,386	126,699	125,752
Intercompany					11,573	14,960	12,747
Total net sales					118,959	141,659	138,499
Long-lived assets:
Long-lived assets	93,573				93,573	97,960	84,703
All Other
Net sales:
Customers					226,377	259,973	248,883
Intercompany					37,612	35,058	22,423
Total net sales					263,989	295,031	271,306
Long-lived assets:
Long-lived assets	84,755				84,755	97,316	112,845
Eliminations
Net sales:
Intercompany					(117,573)	(130,543)	(86,691)
Total net sales					(117,573)	(130,543)	(86,691)
Long-lived assets:
Long-lived assets	$ 0				$ 0	$ 0	$ 0