Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 1,787,833	$ 1,280,846	$ 2,848,579	$ 1,958,134
Cost of sales	1,236,148	907,365	1,995,762	1,395,024
Gross profit	551,685	373,481	852,817	563,110
Selling and administrative expenses	213,099	167,624	385,200	314,721
Impairment of goodwill and other assets	0	0	0	6,944
Operating income	338,586	205,857	467,617	241,445
Interest and other non-operating expenses, net	1,963	2,643	4,545	7,432
Income before income taxes and equity earnings	336,623	203,214	463,072	234,013
Provision for income taxes	76,985	45,733	104,854	45,708
Equity earnings in unconsolidated investments, net	57	74	132	162
Net income	$ 259,695	$ 157,555	$ 358,350	$ 188,467
Earnings per share:
Basic (in dollars per share)	$ 6.47	$ 3.94	$ 8.92	$ 4.71
Diluted (in dollars per share)	$ 6.37	$ 3.87	$ 8.78	$ 4.62
Weighted average shares outstanding: [Abstract]
Basic (in shares)	40,125	39,973	40,169	40,049
Diluted (in shares)	40,745	40,715	40,800	40,837
Cash dividends declared per common share	$ 0.80	$ 0.58	$ 1.38	$ 1.13