Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities
Net income	$ 259,167	$ 216,381
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	14,780	12,162
Stock-based compensation	26,292	12,441
Provision for losses on accounts receivable	18,109	14,069
Amortization of deferred financing costs	1,599	2,434
Amortization of intangible assets	55,737	31,535
Amortization of premium on receivables	2,445	2,448
Deferred income taxes	(1,280)	(4,524)
Equity method investment loss	3,689
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	6,109	3,666
Accounts receivable	(137,942)	(184,367)
Prepaid expenses and other current assets	(3,036)	(1,774)
Other assets	460	38,580
Excess tax benefits related to stock-based compensation	(53,251)	(24,319)
Accounts payable, accrued expenses and customer deposits	124,614	89,279
Net cash provided by operating activities	317,492	208,011
Investing activities
Acquisitions, net of cash acquired	(261,919)	(376,971)
Purchases of property and equipment	(18,279)	(15,348)
Net cash used in investing activities	(280,198)	(392,319)
Financing activities
Excess tax benefits related to stock-based compensation	53,251	24,319
Proceeds from issuance of common stock	21,922	22,800
Borrowings on securitization facility, net	44,600	96,000
Deferred financing costs paid	(546)	(1,970)
Principal payments on notes payable	(20,625)	(21,250)
Payments on revolver - A Facility	(381,385)	(155,000)
Borrowings from revolver - A Facility	182,330	280,000
Payments on foreign revolver - B Facility	(7,337)	(44,533)
Borrowings from foreign revolver - B Facility		53,494
Borrowings from swing line of credit, net	52,059
Other	(462)	(255)
Net cash provided by (used in) financing activities	(56,193)	253,605
Effect of foreign currency exchange rates on cash	(15,097)	(7,257)
Net (decrease) increase in cash and cash equivalents	(33,996)	62,040
Cash and cash equivalents, beginning of period	338,105	283,649
Cash and cash equivalents, end of period	304,109	345,689
Supplemental cash flow information
Cash paid for interest	19,238	13,041
Cash paid for income taxes	$ 63,553	$ 84,695