CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net income	$ 679,089	$ 744,844	$ 582,131
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	111,900	104,596	95,998
Impairment charge	2,346	5,148	2,501
Provision for uncollectible accounts	5,829	1,484	4,946
Deferred income taxes	(35,065)	(3,377)	(38,082)
Share-based compensation expense	49,770	37,755	30,951
Other	2,645	2,619	1,379
Changes in assets and liabilities:
Accounts receivable	(41,398)	(33,141)	(60,722)
Inventories	(121,731)	(52,919)	(18,885)
Accounts payable	3,467	11,233	981
Deferred revenue	(11,019)	(7,551)	(13,373)
Other assets and liabilities	(102,849)	(55,145)	60,238
Net cash provided by operating activities	542,984	755,546	648,063
Cash Flows from Investing Activities:
Purchases of property and equipment	(148,838)	(119,549)	(106,958)
Acquisitions of intangible assets	(10,000)	0	(668)
Equity investments	(25,000)	0	(250)
Acquisitions of businesses, net of cash acquired	(11,512)	(173,418)	(1,500)
Net cash used by investing activities	(195,350)	(292,967)	(109,376)
Cash Flows from Financing Activities:
Borrowings (repayments) on credit facility, net	505,500	73,500	(289,625)
Issuance of senior notes	0	0	200,000
Payments of senior notes	(75,000)	(50,000)	0
Debt issuance costs	(435)	(2,650)	(5,025)
Purchase of minority interest	0	(990)	0
Repurchases of common stock, net	(819,711)	(746,777)	(182,815)
Proceeds from exercises of stock options and employee stock purchase plans	35,747	46,565	51,328
Payment of acquisition-related contingent consideration and holdbacks	(6,431)	(1,500)	(1,676)
Shares withheld for statutory tax withholding payments on restricted stock	(10,606)	(15,562)	(20,603)
Net cash used by financing activities	(370,936)	(697,414)	(248,416)
Net effect of changes in exchange rates on cash	(8,606)	(4,639)	3,331
Net (decrease) increase in cash and cash equivalents	(31,908)	(239,474)	293,602
Cash and cash equivalents at beginning of period	144,454	383,928	90,326
Cash and cash equivalents at end of period	$ 112,546	$ 144,454	$ 383,928