Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net income	$ 523,229,000	$ 748,462,000	$ 650,624,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	31,585,000	30,381,000	28,287,000
Amortization	8,555,000	8,644,000	1,739,000
Share-based compensation	19,582,000	14,879,000	15,187,000
Provisionfor doubtful accounts receivable, net of write-offs	2,197,000	3,580,000	1,134,000
Provision for inventory obsolescence, net of write-offs	1,930,000	5,869,000	3,798,000
Provision for deferred income taxes	10,359,000	15,169,000	4,650,000
Gains on sales of property and equipment	(317,000)	(527,000)	(93,000)
Equity in earnings of unconsolidated investments, net	(177,000)	(353,000)	(291,000)
Net gains (losses) on foreign currency transactions	(813,000)	48,000	325,000
Goodwill impairment	550,000	605,000	0
Other	200,000	472,000	473,000
Changes in operating assets and liabilities, net of effects of acquisitions:
Receivables	10,108,000	19,685,000	(79,940,000)
Product inventories	231,240,000	(263,567,000)	(525,207,000)
Prepaid expenses and other assets	57,840,000	(52,815,000)	(51,199,000)
Accounts payable	96,128,000	7,597,000	114,893,000
Accrued expenses and other current liabilities	(103,967,000)	(53,275,000)	149,110,000
Net cash provided by operating activities	888,229,000	484,854,000	313,490,000
Investing activities
Acquisition of businesses, net of cash acquired	(11,533,000)	(9,264,000)	(811,956,000)
Purchases of property and equipment, net of sale proceeds	(60,096,000)	(43,619,000)	(37,658,000)
Other investments, net	32,000	2,013,000	0
Net cash used in investing activities	(71,597,000)	(50,870,000)	(849,614,000)
Financing activities
Proceeds from revolving line of credit	1,548,618,000	1,917,173,000	1,438,408,000
Payments on revolving line of credit	(1,815,829,000)	(1,970,388,000)	(974,506,000)
Proceeds from term loan under credit facility	0	250,000,000	250,000,000
Payments on term loan under credit facility	(12,500,000)	0	0
Proceeds from asset-backed financing	552,500,000	220,000,000	495,000,000
Payments on asset-backed financing	(560,300,000)	(205,500,000)	(430,000,000)
Payments on Term Facility	(47,313,000)	(9,250,000)	(9,250,000)
Proceeds from Short-Term Debt	19,998,000	28,445,000	9,279,000
Repayments of Short-Term Debt	19,338,000	27,675,000	9,377,000
Payments of deferred financing costs	(52,000)	(170,000)	(2,638,000)
Payments of deferred and contingent acquisition consideration	(551,000)	(1,374,000)	(362,000)
Proceeds from stock issued under share-based compensation plans	10,455,000	8,934,000	17,197,000
Payments of cash dividends	(167,461,000)	(150,624,000)	(119,581,000)
Repurchase of common stock	(306,359,000)	(471,229,000)	(138,039,000)
Net cash provided by (used in) financing activities	(798,132,000)	(411,658,000)	526,131,000
Effect of exchange rate changes on cash and cash equivalents	2,449,000	(1,056,000)	186,000
Change in cash and cash equivalents	20,949,000	21,270,000	(9,807,000)
Cash and cash equivalents at beginning of year	45,591,000	24,321,000	34,128,000
Cash and cash equivalents at end of year	$ 66,540,000	$ 45,591,000	$ 24,321,000