Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net income	$ 109,972	$ 94,153
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,976	7,498
Stock-based compensation	15,186	16,951
Provision for losses on accounts receivable	6,836	8,145
Amortization of deferred financing costs and discounts	1,822	1,744
Amortization of intangible assets	27,362	39,771
Amortization of premium on receivables	990	813
Deferred income taxes	(2,128)	(18,738)
Equity method investment loss	2,193	2,700
Other non-cash operating gains	(215)	(425)
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	23,743	5,580
Accounts receivable	(182,761)	(114,385)
Prepaid expenses and other current assets	(2,086)	1,695
Other assets	(11,696)	(1,835)
Excess tax benefits related to stock-based compensation	(1,118)	(6,418)
Accounts payable, accrued expenses and customer deposits	125,429	30,154
Net cash provided by operating activities	121,505	67,403
Investing activities
Acquisitions, net of cash acquired	(9,006)	(851)
Purchases of property and equipment	(11,739)	(8,105)
Net cash used in investing activities	(20,745)	(8,956)
Financing activities
Excess tax benefits related to stock-based compensation	1,118	6,418
Proceeds from issuance of common stock	387	2,571
(Payments) borrowings on securitization facility, net	(63,000)	4,000
Principal payments on notes payable	(25,875)	(25,875)
Borrowings from revolver – A Facility	40,000	0
Payments on revolver – A Facility	(110,000)	(120,736)
Borrowings from swing line of credit, net	0	30,865
Payment of contingent consideration	0	(39,808)
Other	(19)	(76)
Net cash used in financing activities	(157,389)	(142,641)
Effect of foreign currency exchange rates on cash	8,795	(13,482)
Net decrease in cash and cash equivalents	(47,834)	(97,676)
Cash and cash equivalents, beginning of period	447,152	477,069
Cash and cash equivalents, end of period	399,318	379,393
Supplemental cash flow information
Cash paid for interest	15,310	21,290
Cash paid for income taxes	$ 11,824	$ 15,992