Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 2,371,482	$ 2,475,807	$ 2,147,770
Cost of sales	1,832,280	1,955,463	1,654,656
Gross profit	539,202	520,344	493,114
Selling, general and administrative expenses	338,992	321,556	278,833
Operating profit	200,210	198,788	214,281
Interest expense, net	8,796	6,436	1,437
Income before income taxes	191,414	192,352	212,844
Provision for income taxes	44,905	43,801	79,960
Net income	$ 146,509	$ 148,551	$ 132,884
Net income per common share:
Basic (in usd per share)	$ 5.86	$ 5.90	$ 5.31
Diluted (in usd per share)	$ 5.84	$ 5.83	$ 5.24
Weighted average common shares outstanding:
Basic (in shares)	24,998	25,178	25,020
Diluted (in shares)	25,093	25,463	25,375