Segments and Geographic Information (Sales and Long-Lived Assets by Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales:
Customers	$ 818,811	$ 825,287	$ 817,056
Intercompany	0	0	0
Total net sales	818,811	825,287	817,056
Long-lived assets:
Long-lived assets	433,041	424,726	431,290
United States
Net sales:
Customers	444,176	463,659	441,882
Intercompany	51,521	56,420	55,281
Total net sales	495,697	520,079	497,163
Long-lived assets:
Long-lived assets	106,545	110,919	114,207
Mexico
Net sales:
Customers	125,752	119,234	122,308
Intercompany	12,747	12,387	13,964
Total net sales	138,499	131,621	136,272
Long-lived assets:
Long-lived assets	213,651	202,437	199,577
All Other
Net sales:
Customers	248,883	242,394	252,866
Intercompany	22,423	20,930	24,470
Total net sales	271,306	263,324	277,336
Long-lived assets:
Long-lived assets	112,845	111,370	117,506
Eliminations
Net sales:
Intercompany	(86,691)	(89,737)	(93,715)
Total net sales	(86,691)	(89,737)	(93,715)
Long-lived assets:
Long-lived assets	$ 0	$ 0	$ 0