Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues	$ 540,238	$ 565,252	$ 1,058,823	$ 1,112,231
Costs and expenses:
Cost of sales	403,727	418,040	792,621	826,617
Selling, general and administrative	83,523	80,831	161,140	159,258
Amortization expense	3,156	3,155	6,312	6,311
Goodwill, Impairment Loss	7,585	0	7,585	0
Total costs and expenses	497,991	502,026	967,658	992,186
Earnings (loss) from operations	42,247	63,226	91,165	120,045
Other expenses and income:
Interest expense	6,755	11,726	13,809	21,501
Interest income	(70)	(122)	(128)	(261)
Loss on extinguishment of debt (Note 3)	0	2,966	0	16,318
Other income, net	(77)	(1,436)	(774)	(2,312)
Total other expenses (income), net	6,608	13,134	12,907	35,246
Earnings (loss) before income taxes	35,639	50,092	78,258	84,799
Income tax expense (Note 1)	13,932	19,840	30,130	33,136
Net earnings	$ 21,707	$ 30,252	$ 48,128	$ 51,663
Net earnings per common share, basic (Note 7)	$ 0.53	$ 0.63	$ 1.16	$ 1.06
Net earnings per common share, diluted (Note 7)	$ 0.51	$ 0.60	$ 1.11	$ 1.01
Weighted-average common shares outstanding, basic (Note 7)	41,170	47,877	41,642	48,903
Weighted-average common shares outstanding, diluted (Note 7)	42,719	50,167	43,382	51,250