Condensed Consolidated Statements Of Income (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Statement [Abstract]
Net sales	$ 793,484	$ 824,463
Cost of sales	703,173	688,058
Selling, general and administrative	69,607	76,511
Depreciation	13,224	12,867
Amortization	2,348	2,349
Equity in losses of investees	1,703	2,478
Relocation costs	3,863	0
Operating income (loss)	(434)	42,200
Interest income	899	1,110
Interest expense	(10,507)	(14,208)
Income (loss) before income taxes	(10,042)	29,102
Income tax expense	(1,100)	(4,900)
Net income (loss)	$ (11,142)	$ 24,202
Earnings (loss) per common share - basic	$ (0.24)	$ 0.53
Earnings (loss) per common share - diluted	$ (0.24)	$ 0.52