Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 412,370	$ 345,296	$ 1,275,999	$ 1,068,838
Cost of sales	306,820	271,171	945,104	836,250
Gross profit	105,550	74,125	330,895	232,588
Selling, general and administrative expenses	60,412	46,954	170,641	139,945
Operating profit	45,138	27,171	160,254	92,643
Interest expense, net	396	595	1,285	1,399
Income before income taxes	44,742	26,576	158,969	91,244
Provision for income taxes	14,898	9,313	55,597	33,039
Net income	$ 29,844	$ 17,263	$ 103,372	$ 58,205
Net income per common share:
Basic (in usd per share)	$ 1.21	$ 0.71	$ 4.20	$ 2.40
Diluted (in usd per share)	$ 1.19	$ 0.70	$ 4.15	$ 2.36
Weighted average common shares outstanding:
Basic (in shares)	24,724	24,289	24,587	24,261
Diluted (in shares)	25,060	24,686	24,882	24,614