Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues	$ 523,822	$ 528,391	$ 1,582,645	$ 1,640,622
Costs and expenses:
Cost of sales	388,284	395,728	1,180,905	1,222,345
Selling, general and administrative	73,358	80,520	234,498	239,778
Amortization expense	3,245	3,156	9,557	9,467
Goodwill, Impairment Loss	0	0	7,585	0
Total costs and expenses	464,887	479,404	1,432,545	1,471,590
Earnings (loss) from operations	58,935	48,987	150,100	169,032
Other expenses and income:
Interest expense	7,563	8,148	21,372	29,649
Interest income	(46)	(54)	(174)	(315)
Loss on extinguishment of debt (Note 3)	0	0	0	16,318
Other income, net	249	(3,856)	(525)	(6,168)
Total other expenses (income), net	7,766	4,238	20,673	39,484
Earnings (loss) before income taxes	51,169	44,749	129,427	129,548
Income tax expense (Note 1)	14,429	17,255	44,559	50,391
Net earnings	$ 36,740	$ 27,494	$ 84,868	$ 79,157
Net earnings per common share, basic (Note 7)	$ 0.94	$ 0.60	$ 2.08	$ 1.65
Net earnings per common share, diluted (Note 7)	$ 0.90	$ 0.58	$ 2.00	$ 1.58
Weighted-average common shares outstanding, basic (Note 7)	39,047	45,689	40,777	47,831
Weighted-average common shares outstanding, diluted (Note 7)	40,832	47,766	42,532	50,089