Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net income	$ 614,493	$ 494,365
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	55,605	48,150
Stock-based compensation	52,085	35,069
Provision for credit losses on accounts and other receivables	19,419	152,485
Amortization of deferred financing costs and discounts	4,903	5,028
Amortization of intangible assets and premium on receivables	153,579	141,967
Loss on extinguishment of debt	6,230	0
Deferred income taxes	16,246	(5,747)
Investment gain	(9)	(30,008)
Other	81	(482)
Changes in operating assets and liabilities (net of acquisitions/dispositions):
Accounts and other receivables	(1,020,900)	49,690
Prepaid expenses and other current assets	190,543	26,105
Other assets	28,370	6,129
Accounts payable, accrued expenses and customer deposits	478,896	291,945
Net cash provided by operating activities	599,541	1,214,696
Investing activities
Acquisitions, net of cash acquired	(545,052)	(72,557)
Purchases of property and equipment	(74,455)	(55,019)
Proceeds from disposal of investment	0	52,963
Other	(2,281)	0
Net cash used in investing activities	(621,788)	(74,613)
Financing activities
Proceeds from issuance of common stock	48,159	95,780
Repurchase of common stock	(822,277)	(788,409)
Borrowings (payments) on securitization facility, net	398,000	(282,973)
Deferred financing costs	(21,508)	(2,474)
Proceeds from notes payable	1,150,000	0
Principal payments on notes payable	(462,438)	(134,097)
Borrowings from revolver	1,140,000	1,198,500
Payments on revolver	(798,851)	(1,287,899)
Payments on swing line of credit, net	(51,049)	(20,111)
Other	(811)	(244)
Net cash provided by (used in) financing activities	579,225	(1,221,927)
Effect of foreign currency exchange rates on cash	(24,660)	(222,533)
Net increase (decrease) in cash and cash equivalents and restricted cash	532,318	(304,377)
Cash and cash equivalents and restricted cash, beginning of period	1,476,619	1,675,237
Cash and cash equivalents and restricted cash, end of period	2,008,937	1,370,860
Supplemental cash flow information
Cash paid for interest	96,146	98,564
Cash paid for income taxes	$ 147,028	$ 119,089