Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 317,659	$ 269,491	$ 951,832	$ 800,430
Cost of sales	206,410	189,488	632,671	544,615
Selling and administrative expenses	60,364	51,972	187,770	166,679
Total operating costs and expenses	266,774	241,460	820,441	711,294
Operating income	50,885	28,031	131,391	89,136
Interest expense	2,435	2,401	8,558	10,000
Other expense (income), net	741	241	1,768	1,702
Income from continuing operations before income taxes	47,709	25,389	121,065	77,434
Income taxes	13,407	4,008	33,782	31,426
Income from continuing operations	34,302	21,381	87,283	46,008
(Loss) income from discontinued operations, net of income taxes (Note 2)	(425)	(476)	(425)	197,696
Net income	$ 33,877	$ 20,905	$ 86,858	$ 243,704
Basic:
Income from continuing operations (in dollars per share)	$ 0.63	$ 0.40	$ 1.60	$ 0.86
(Loss) income from discontinued operations, net of income taxes (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.01)	$ 3.67
Net income (in dollars per share)	$ 0.62	$ 0.39	$ 1.59	$ 4.53
Diluted:
Income from continuing operations (in dollars per share)	$ 0.62	$ 0.39	$ 1.57	$ 0.84
(Loss) income from discontinued operations, net of income taxes (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.01)	$ 3.60
Net income (in dollars per share)	$ 0.61	$ 0.38	$ 1.56	$ 4.44
Dividends (in dollars per share)	$ 0.11	$ 0.11	$ 0.33	$ 0.31
Weighted average common shares outstanding:
Basic (in shares)	54,879,329	53,009,720	54,756,794	53,818,950
Diluted (in shares)	55,509,658	54,304,990	55,803,370	54,854,456