Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 954,327	$ 839,497	$ 704,216
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	92,010	75,571	65,181
Stock based compensation	121,416	80,071	43,384
Provision for losses on accounts and other receivables	131,096	37,919	158,549
Amortization of deferred financing costs and discounts	7,748	6,831	6,486
Amortization of intangible assets and premium on receivables	230,272	208,625	189,620
Deferred income taxes	(33,174)	11,026	15,668
Loss on extinguishment of debt	1,934	16,194	0
Investment loss (gain), net	1,382	(9)	(30,008)
Other non-cash operating expense (income), net	282	(784)	(1,985)
Changes in operating assets and liabilities (net of acquisitions):
Accounts receivable and other receivables	(598,674)	(731,137)	264,140
Prepaid expenses and other current assets	(17,543)	141,058	119,531
Derivative assets and liabilities, net	(11,260)	(15,360)	(58,347)
Other assets	(41,068)	47,055	79,405
Accounts payable, accrued expenses and customer deposits	(83,951)	480,506	(83,251)
Net cash provided by operating activities	754,797	1,197,063	1,472,589
Investing activities
Acquisitions, net of cash acquired	(216,917)	(602,120)	(80,787)
Purchases of property and equipment	(151,428)	(111,530)	(78,425)
Proceeds from disposal of investment	0	0	52,963
Other	0	(2,281)	0
Net cash used in investing activities	(368,345)	(715,931)	(106,249)
Financing activities
Proceeds from issuance of common stock	49,404	48,781	136,797
Repurchase of common stock	(1,405,200)	(1,355,722)	(849,910)
Borrowings (payments) on securitization facility, net	169,000	418,000	(270,973)
Deferred financing costs paid and debt discount	(10,355)	(38,920)	(2,637)
Proceeds from issuance of notes payable	3,000,000	1,900,000	0
Principal payments on notes payable	(2,824,000)	(507,500)	(175,285)
Borrowings from revolver	7,236,000	1,910,000	1,243,500
Payments on revolver	(6,526,000)	(1,978,851)	(1,496,907)
Borrowings (payments) on swing line of credit, net	194	(51,049)	(1,042)
Other	(271)	(811)	(344)
Net cash (used in) provided by financing activities	(311,228)	343,928	(1,416,801)
Effect of foreign currency exchange rates on cash	(36,739)	(50,984)	(148,157)
Net increase (decrease) in cash and cash equivalents and restricted cash	38,485	774,076	(198,618)
Cash and cash equivalents and restricted cash, beginning of year	2,250,695	1,476,619	1,675,237
Cash and cash equivalents and restricted cash, end of year	2,289,180	2,250,695	1,476,619
Supplemental cash flow information
Cash paid for interest	229,641	132,504	126,460
Cash paid for income taxes	$ 358,231	$ 229,721	$ 165,315