Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 827,729	$ 586,221	$ 2,013,164	$ 1,807,461
Cost of sales	606,290	450,748	1,504,378	1,390,741
Gross profit	221,439	135,473	508,786	416,720
Selling, general and administrative expenses	127,006	86,320	349,305	254,155
Operating profit	94,433	49,153	159,481	162,565
Interest expense, net	1,948	1,900	10,843	6,506
Income before income taxes	92,485	47,253	148,638	156,059
Provision for income taxes	24,138	11,444	38,891	38,357
Net income	$ 68,347	$ 35,809	$ 109,747	$ 117,702
Net income per common share:
Basic (in usd per share)	$ 2.72	$ 1.43	$ 4.37	$ 4.71
Diluted (in usd per share)	$ 2.70	$ 1.42	$ 4.35	$ 4.70
Weighted average common shares outstanding:
Basic (in shares)	25,162	25,031	25,125	24,984
Diluted (in shares)	25,313	25,156	25,220	25,053