Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 1,230,754	$ 1,193,975	$ 1,262,006
Cost of sales	790,299	782,817	829,648
Selling and administrative expenses	248,277	242,762	252,384
Total operating costs and expenses	1,038,576	1,025,579	1,082,032
Operating income	192,178	168,396	179,974
Interest expense	11,883	10,698	11,392
Other expense (income), net	(2,326)	(248)	2,082
Income from continuing operations before income taxes	182,621	157,946	166,500
Income taxes	47,020	36,566	45,959
Income from continuing operations	135,601	121,380	120,541
Loss from discontinued operations, net of income taxes of $0, $0 and $315, respectively	0	0	(2,171)
Net income	$ 135,601	$ 121,380	$ 118,370
Basic:
Income from continuing operations (in dollars per share)	$ 2.50	$ 2.21	$ 2.20
Loss from discontinued operations, net of income taxes (in dollars per share)	0.00	0.00	(0.04)
Net income (in dollars per share)	2.50	2.21	2.16
Diluted:
Income from continuing operations (in dollars per share)	2.48	2.19	2.16
Loss from discontinued operations, net of income taxes (in dollars per share)	0.00	0.00	(0.04)
Net income (in dollars per share)	2.48	2.19	2.12
Dividends	$ 0.51	$ 0.48	$ 0.45
Weighted average common shares outstanding:
Basic (in shares)	54,191,013	55,028,063	54,791,030
Diluted (in shares)	54,631,313	55,513,219	55,723,267