Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 440,831	$ 362,085	$ 863,629	$ 723,542
Cost of sales	323,927	280,025	638,284	565,079
Gross profit	116,904	82,060	225,345	158,463
Selling, general and administrative expenses	57,516	48,426	110,229	92,991
Operating profit	59,388	33,634	115,116	65,472
Interest expense, net	413	615	889	804
Income before income taxes	58,975	33,019	114,227	64,668
Provision for income taxes	21,406	12,150	40,699	23,726
Net income	$ 37,569	$ 20,869	$ 73,528	$ 40,942
Net income per common share:
Basic (in usd per share)	$ 1.52	$ 0.86	$ 3.00	$ 1.69
Diluted (in usd per share)	$ 1.51	$ 0.85	$ 2.96	$ 1.67
Weighted average common shares outstanding:
Basic (in shares)	24,662	24,279	24,542	24,247
Diluted (in shares)	24,916	24,615	24,822	24,578