Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Net sales	$ 269,491	$ 232,476	$ 800,430	$ 670,580
Cost of sales	189,488	170,349	544,615	483,138
Selling and administrative expenses	51,972	39,641	166,679	114,578
Total operating costs and expenses	241,460	209,990	711,294	597,716
Operating income	28,031	22,486	89,136	72,864
Interest expense	2,401	3,243	10,000	8,046
Other expense (income), net	241	873	1,702	1,787
Income from continuing operations before income taxes	25,389	18,370	77,434	63,031
Income taxes	4,008	2,342	31,426	9,926
Income from continuing operations	21,381	16,028	46,008	53,105
(Loss) income from discontinued operations, net of income taxes (Note 2)	(476)	2,453	197,696	12,414
Net income	$ 20,905	$ 18,481	$ 243,704	$ 65,519
Basic:
Income from continuing operations (in dollars per share)	$ 0.40	$ 0.30	$ 0.86	$ 0.97
(Loss) income from discontinued operations, net of income taxes (in dollars per share)	$ (0.01)	$ 0.04	$ 3.67	$ 0.23
Net income (in dollars per share)	$ 0.39	$ 0.34	$ 4.53	$ 1.20
Diluted:
Income from continuing operations (in dollars per share)	$ 0.39	$ 0.30	$ 0.84	$ 0.97
(Loss) income from discontinued operations, net of income taxes (in dollars per share)	$ (0.01)	$ 0.04	$ 3.60	$ 0.22
Net income (in dollars per share)	$ 0.38	$ 0.34	$ 4.44	$ 1.19
Dividends (in dollars per share)	$ 0.11	$ 0.10	$ 0.31	$ 0.30
Weighted average common shares outstanding:
Basic (in shares)	53,009,720	54,508,387	53,818,950	54,618,636
Diluted (in shares)	54,304,990	55,098,263	54,854,456	55,234,478