Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net income	$ 380,486	$ 305,548
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	36,094	31,607
Stock-based compensation	35,632	23,164
Provision for credit losses on accounts and other receivables	8,521	139,000
Amortization of deferred financing costs and discounts	3,248	2,886
Amortization of intangible assets and premium on receivables	98,853	95,031
Loss on extinguishment of debt	6,230	0
Deferred income taxes	12,897	(8,730)
Investment gain	(9)	(31,338)
Other	81	(268)
Changes in operating assets and liabilities (net of acquisitions/dispositions):
Accounts and other receivables	(706,574)	359,685
Prepaid expenses and other current assets	115,239	46,216
Other assets	20,715	828
Accounts payable, accrued expenses and customer deposits	345,029	(161,461)
Net cash provided by operating activities	356,442	802,168
Investing activities
Acquisitions, net of cash acquired	(114,994)	(492)
Purchases of property and equipment	(45,765)	(36,870)
Other	(2,281)	0
Net cash used in investing activities	(163,040)	(37,362)
Financing activities
Proceeds from issuance of common stock	35,921	92,977
Repurchase of common stock	(416,585)	(557,361)
Borrowings (payments) on securitization facility, net	300,000	(316,973)
Deferred financing costs and debt discount	(21,039)	(974)
Proceeds from notes payable	1,150,000	0
Principal payments on notes payable	(419,250)	(92,910)
Borrowings from revolver	405,000	573,500
Payments on revolver	(623,851)	(726,644)
Payments on swing line of credit, net	(51,157)	(3,879)
Other	(366)	(169)
Net cash provided by (used in) financing activities	358,673	(1,032,433)
Effect of foreign currency exchange rates on cash	30,609	(216,264)
Net increase (decrease) in cash and cash equivalents and restricted cash	582,684	(483,891)
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	2,059,303	1,191,346
Supplemental cash flow information
Cash paid for interest	54,818	68,454
Cash paid for income taxes	$ 113,969	$ 56,790