Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Net sales	$ 322,074	$ 267,394	$ 634,173	$ 530,940
Cost of sales	211,705	177,411	426,261	355,127
Selling and administrative expenses	64,988	53,834	127,406	114,708
Total operating costs and expenses	276,693	231,245	553,667	469,835
Operating income	45,381	36,149	80,506	61,105
Interest expense	2,804	3,241	6,123	7,598
Other expense (income), net	792	495	1,027	1,462
Income from continuing operations before income taxes	41,785	32,413	73,356	52,045
Income taxes	11,557	23,218	20,375	27,417
Income from continuing operations	30,228	9,195	52,981	24,628
Income from discontinued operations, net of income taxes (Note 2)	0	200,132	0	198,171
Net income	$ 30,228	$ 209,327	$ 52,981	$ 222,799
Basic:
Income from continuing operations (in dollars per share)	$ 0.55	$ 0.18	$ 0.97	$ 0.46
Income from discontinued operations, net of income taxes (in dollars per share)	$ 0.00	$ 3.72	$ 0.00	$ 3.65
Net income (in dollars per share)	$ 0.55	$ 3.90	$ 0.97	$ 4.11
Diluted:
Income from continuing operations (in dollars per share)	$ 0.54	$ 0.17	$ 0.95	$ 0.45
Income from discontinued operations, net of income taxes (in dollars per share)	$ 0.00	$ 3.65	$ 0.00	$ 3.59
Net income (in dollars per share)	$ 0.54	$ 3.82	$ 0.95	$ 4.04
Dividends (in dollars per share)	$ 0.11	$ 0.10	$ 0.22	$ 0.20
Weighted average common shares outstanding:
Basic (in shares)	54,740,750	53,738,051	54,695,865	54,230,272
Diluted (in shares)	55,927,881	54,809,896	55,950,467	55,135,892