Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 1,411,448	$ 1,139,229	$ 4,260,027	$ 3,097,362
Cost of sales	969,549	810,531	2,965,311	2,205,555
Gross profit	441,899	328,698	1,294,716	891,807
Selling and administrative expenses	206,023	180,465	591,223	495,186
Recovery of other asset	(1,400)		(1,400)
Impairment of goodwill and other assets		0	0	6,944
Operating income	237,276	148,233	704,893	389,677
Interest and other non-operating expenses, net	2,317	1,861	6,862	9,292
Income before income taxes and equity earnings	234,959	146,372	698,031	380,385
Provision for income taxes	50,386	27,360	155,240	73,068
Equity earnings in unconsolidated investments, net	92	86	224	248
Net income	$ 184,665	$ 119,098	$ 543,015	$ 307,565
Earnings per share:
Basic (in dollars per share)	$ 4.60	$ 2.97	$ 13.53	$ 7.68
Diluted (in dollars per share)	$ 4.54	$ 2.92	$ 13.32	$ 7.53
Weighted average shares outstanding: [Abstract]
Basic (in shares)	40,101	40,123	40,146	40,073
Diluted (in shares)	40,691	40,839	40,766	40,849
Cash dividends declared per common share	$ 0.80	$ 0.58	$ 2.18	$ 1.71