Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net income	$ 224,157	$ 192,831
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	16,311	15,096
Stock-based compensation	32,620	30,500
Provision for losses on accounts receivable	13,729	13,022
Amortization of deferred financing costs and discounts	3,651	3,517
Amortization of intangible assets	66,114	80,186
Amortization of premium on receivables	2,339	1,627
Deferred income taxes	(9,248)	(40,894)
Equity method investment (income) loss	(4,991)	7,818
Other non-cash operating income	(446)	(772)
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	13,555	5,790
Accounts receivable	(392,545)	(233,528)
Prepaid expenses and other current assets	(4,636)	24
Other assets	(9,362)	(2,961)
Excess tax benefits related to stock-based compensation	(3,186)	(9,639)
Accounts payable, accrued expenses and customer deposits	260,794	135,795
Net cash provided by operating activities	208,856	198,412
Investing activities
Acquisitions, net of cash acquired	(13,167)	(7,954)
Purchases of property and equipment	(24,757)	(16,234)
Net cash used in investing activities	(37,924)	(24,188)
Financing activities
Excess tax benefits related to stock-based compensation	3,186	9,639
Proceeds from issuance of common stock	7,964	7,105
Repurchase of common stock	(26,037)	0
Borrowings on securitization facility, net	99,000	89,000
Principal payments on notes payable	(51,750)	(51,750)
Borrowings from revolver – A Facility	140,000	0
Payments on revolver – A Facility	(290,000)	(276,818)
Borrowings from swing line of credit, net	0	9,441
Payment of contingent consideration	0	(39,808)
Other	(666)	(145)
Net cash used in financing activities	(118,303)	(253,336)
Effect of foreign currency exchange rates on cash	(6,696)	(13,782)
Net increase (decrease) in cash and cash equivalents	45,933	(92,894)
Cash and cash equivalents, beginning of period	447,152	477,069
Cash and cash equivalents, end of period	493,085	384,175
Supplemental cash flow information
Cash paid for interest	30,361	38,883
Cash paid for income taxes	$ 64,345	$ 30,234