Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 748,462	$ 650,624	$ 366,738
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	30,381	28,287	27,967
Amortization	8,644	1,739	1,431
Share-based compensation	14,879	15,187	14,516
Provision (benefit) for doubtful accounts receivable, net of write-offs	3,580	1,134	(664)
Provision for inventory obsolescence, net of write-offs	5,869	3,798	2,362
(Benefit) provision for deferred income taxes	15,169	4,650	(2,542)
Losses (gains) on sales of property and equipment	(527)	(93)	38
Equity earnings in unconsolidated investments, net	(353)	(291)	(295)
Net losses on foreign currency transactions	48	325	1,748
Goodwill, Impairment Loss	605	0
Impairment of goodwill and other assets		0	6,944
Other	472	473	410
Changes in operating assets and liabilities, net of effects of acquisitions:
Receivables	19,685	(79,940)	(38,688)
Product inventories	(263,567)	(525,207)	(42,447)
Prepaid expenses and other assets	(52,815)	(51,199)	(13,744)
Accounts payable	7,597	114,893	(9,212)
Accrued expenses and other current liabilities	(53,275)	149,110	83,019
Net cash provided by operating activities	484,854	313,490	397,581
Investing activities
Acquisition of businesses, net of cash acquired	(9,264)	(811,956)	(124,587)
Purchases of property and equipment, net of sale proceeds	(43,619)	(37,658)	(21,702)
Other investments, net	2,013	0	0
Net cash used in investing activities	(50,870)	(849,614)	(146,289)
Financing activities
Proceeds from revolving line of credit	1,917,173	1,438,408	1,053,968
Payments on revolving line of credit	(1,970,388)	(974,506)	(1,145,616)
Proceeds from Long-term Lines of Credit	250,000	250,000	0
Proceeds from asset-backed financing	220,000	495,000	326,700
Payments on asset-backed financing	(205,500)	(430,000)	(321,700)
Payments on Term Facility	(9,250)	(9,250)	(9,250)
Proceeds from short-term borrowings and current portion of long-term debt	28,445	9,279	13,822
Payments on short-term borrowings and current portion of long-term debt	(27,675)	(9,377)	(13,698)
Payments of deferred financing costs	(170)	(2,638)	(12)
Payments of deferred and contingent acquisition consideration	(1,374)	(362)	(281)
Proceeds from stock issued under share-based compensation plans	8,934	17,197	19,824
Payments of cash dividends	(150,624)	(119,581)	(91,929)
Purchases of treasury stock	(471,229)	(138,039)	(76,199)
Net cash provided by (used in) financing activities	(411,658)	526,131	(244,371)
Effect of exchange rate changes on cash and cash equivalents	(1,056)	186	(1,376)
Change in cash and cash equivalents	21,270	(9,807)	5,545
Cash and cash equivalents at beginning of year	24,321	34,128	28,583
Cash and cash equivalents at end of year	$ 45,591	$ 24,321	$ 34,128