Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net sales	$ 267,394	$ 215,310	$ 530,940	$ 438,104
Cost of sales	177,411	152,367	355,127	312,788
Selling and administrative expenses	53,834	37,183	114,708	74,938
Total operating costs and expenses	231,245	189,550	469,835	387,726
Operating income	36,149	25,760	61,105	50,378
Interest expense	3,241	2,435	7,598	4,803
Other expense (income), net	495	55	1,462	914
Income from continuing operations before income taxes	32,413	23,270	52,045	44,661
Income taxes	23,218	3,783	27,417	7,584
Income from continuing operations	9,195	19,487	24,628	37,077
Income from discontinued operations, net of income taxes (Note 2)	200,132	5,344	198,171	9,961
Net income	$ 209,327	$ 24,831	$ 222,799	$ 47,038
Basic:
Income from continuing operations (in dollars per share)	$ 0.18	$ 0.36	$ 0.46	$ 0.68
Income from discontinued operations, net of income taxes (in dollars per share)	$ 3.72	$ 0.10	$ 3.65	$ 0.18
Net income (in dollars per share)	$ 3.90	$ 0.46	$ 4.11	$ 0.86
Diluted:
Income from continuing operations (in dollars per share)	$ 0.17	$ 0.35	$ 0.45	$ 0.67
Income from discontinued operations, net of income taxes (in dollars per share)	$ 3.65	$ 0.10	$ 3.59	$ 0.18
Net income (in dollars per share)	$ 3.82	$ 0.45	$ 4.04	$ 0.85
Dividends (in dollars per share)	$ 0.10	$ 0.10	$ 0.20	$ 0.20
Weighted average common shares outstanding:
Basic (in shares)	53,738,051	54,543,098	54,230,272	54,674,366
Diluted (in shares)	54,809,896	55,150,806	55,135,892	55,303,192