Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Operating activities
Net income	$ 147,060			$ 172,107
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	15,788			15,132
Stock-based compensation	14,175			12,541
Provision for losses on accounts receivable	117,746			22,164
Amortization of deferred financing costs and discounts	1,354			1,205
Amortization of intangible assets and premium on receivables	48,688			52,313
Deferred income taxes	(7,322)			(2,696)
Investment loss	2,371			15,660
Other non-cash operating income	(38)			(1,574)
Changes in operating assets and liabilities (net of acquisitions/dispositions):
Accounts and other receivables	156,052			(302,395)
Prepaid expenses and other current assets	(45,149)			644
Other assets	(3,046)			(14,517)
Accounts payable, accrued expenses and customer deposits	(27,646)			326,910
Net cash provided by operating activities	420,033			297,494
Investing activities
Acquisitions, net of cash acquired	(467)			0
Purchases of property and equipment	(18,257)	$ (26,490)	$ (17,470)	(14,506)	$ (25,075)
Net cash used in investing activities	(18,724)			(14,506)
Financing activities
Proceeds from issuance of common stock	73,274			29,795
Repurchase of common stock	(530,237)			(3,322)
(Payments) borrowings on securitization facility, net	(151,973)
(Payments) borrowings on securitization facility, net				56,000
Deferred financing costs paid and debt discount	0			(284)
Principal payments on notes payable	(51,722)			(32,438)
Borrowings from revolver	573,500			0
Payments on revolver	(204,460)			(353,638)
(Payments) borrowings on swing line of credit, net	(22,741)
(Payments) borrowings on swing line of credit, net				31,032
Other	(92)			(63)
Net cash used in financing activities	(314,451)			(272,918)
Effect of foreign currency exchange rates on cash	(209,859)			(2,392)
Net (decrease) increase in cash and cash equivalents and restricted cash	(123,001)			7,678
Cash and cash equivalents and restricted cash, beginning of period	1,675,237		$ 1,372,571	1,364,893
Cash and cash equivalents and restricted cash, end of period	1,552,236	$ 1,675,237		1,372,571	$ 1,364,893
Supplemental cash flow information
Cash paid for interest	40,394			46,904
Cash paid for income taxes	$ 32,939			$ 17,894