Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net income	$ 309,601	$ 259,167
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	22,941	14,780
Stock-based compensation	44,387	26,292
Provision for losses on accounts receivable	18,287	18,109
Amortization of deferred financing costs and discounts	5,295	1,599
Amortization of intangible assets	120,055	55,737
Amortization of premium on receivables	2,439	2,445
Deferred income taxes	(27,640)	(1,280)
Equity method investment loss	13,926	3,689
Other non-cash operating expenses	(2,476)
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	5,697	6,109
Accounts receivable	(71,310)	(137,942)
Prepaid expenses and other current assets	2,724	(3,036)
Other assets	(3,297)	460
Excess tax benefits related to stock-based compensation	(24,455)	(53,251)
Accounts payable, accrued expenses, income taxes and deferred revenue	108,278	124,614
Net cash provided by operating activities	524,452	317,492
Investing activities
Acquisitions, net of cash acquired	(17,021)	(261,919)
Purchases of property and equipment	(29,526)	(18,279)
Net cash used in investing activities	(46,547)	(280,198)
Financing activities
Excess tax benefits related to stock-based compensation	24,455	53,251
Proceeds from issuance of common stock	13,977	21,922
Borrowings on securitization facility, net	(10,000)	44,600
Deferred financing costs paid		(546)
Principal payments on notes payable	(77,625)	(20,625)
Borrowings from revolver - A Facility		182,330
Payments on revolver - A Facility	(411,818)	(381,385)
Payments on foreign revolver - B Facility		(7,337)
Borrowings from swing line of credit, net	(601)	52,059
Payment of contingent consideration	(40,310)
Other	(342)	(462)
Net cash (used in) provided by financing activities	(502,264)	(56,193)
Effect of foreign currency exchange rates on cash	(30,320)	(15,097)
Net decrease in cash and cash equivalents	(54,679)	(33,996)
Cash and cash equivalents, beginning of period	477,069	338,105
Cash and cash equivalents, end of period	422,390	304,109
Supplemental cash flow information
Cash paid for interest	55,959	19,238
Cash paid for income taxes	$ 47,339	$ 63,553