Segments and Geographic Information (Sales and Long-Lived Assets by Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales:
Customers	$ 825,287	$ 817,056	$ 799,794
Intercompany	0	0	0
Total net sales	825,287	817,056	799,794
Long-lived assets:
Long-lived assets	424,726	431,290	439,737
United States
Net sales:
Customers	463,659	441,882	444,534
Intercompany	56,420	55,281	55,432
Total net sales	520,079	497,163	499,966
Long-lived assets:
Long-lived assets	110,919	114,207	118,363
Mexico
Net sales:
Customers	119,234	122,308	121,282
Intercompany	12,387	13,964	10,846
Total net sales	131,621	136,272	132,128
Long-lived assets:
Long-lived assets	202,437	199,577	197,604
All Other
Net sales:
Customers	242,394	252,866	233,978
Intercompany	20,930	24,470	16,085
Total net sales	263,324	277,336	250,063
Long-lived assets:
Long-lived assets	111,370	117,506	123,770
Eliminations
Net sales:
Intercompany	(89,737)	(93,715)	(82,363)
Total net sales	(89,737)	(93,715)	(82,363)
Long-lived assets:
Long-lived assets	$ 0	$ 0	$ 0