Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 214,013	$ 203,036	$ 395,028	$ 376,940
Freight billed to customers	838	420	1,249	854
Total revenues	214,851	203,456	396,277	377,794
Cost of sales	165,015	155,425	310,295	295,886
Gross profit	49,836	48,031	85,982	81,908
Selling, general and administrative expenses	25,224	24,719	50,626	47,543
Special charges	(100)	156	(49)	388
Income from operations	24,712	23,156	35,405	33,977
(Loss) gain on redemption of debt			(2,803)	56,792
Other income	3,064	1,656	6,070	893
Earnings before interest and income taxes	27,776	24,812	38,672	91,662
Interest expense	10,787	11,768	22,370	21,388
Income before income taxes	16,989	13,044	16,302	70,274
Provision for income taxes	1,583	3,477	1,897	5,297
Net income	$ 15,406	$ 9,567	$ 14,405	$ 64,977
Net income per share:
Basic:	$ 0.77	$ 0.59	$ 0.72	$ 3.98
Diluted:	$ 0.74	$ 0.47	$ 0.69	$ 3.21
Dividends per share	$ 0	$ 0	$ 0	$ 0