Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities
Net income	$ 216,381	$ 156,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,162	9,831
Stock-based compensation	12,441	14,287
Provision for losses on accounts receivable	14,069	16,788
Amortization of deferred financing costs	2,434	1,596
Amortization of intangible assets	31,535	23,044
Amortization of premium on receivables	2,448	2,449
Deferred income taxes	(4,524)	2,501
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	3,666	3,576
Accounts receivable	(184,367)	(178,715)
Prepaid expenses and other current assets	(1,774)	(4,352)
Other assets	38,580	(45,291)
Excess tax benefits related to stock-based compensation	(24,319)	(23,177)
Accounts payable, accrued expenses and customer deposits	89,279	54,466
Net cash provided by operating activities	208,011	33,131
Investing activities
Acquisitions, net of cash acquired	(376,971)	(189,819)
Purchases of property and equipment	(15,348)	(13,634)
Net cash used in investing activities	(392,319)	(203,453)
Financing activities
Excess tax benefits related to stock-based compensation	24,319	23,177
Proceeds from issuance of common stock	22,800	21,391
Borrowings on securitization facility, net	96,000	75,000
Deferred financing fees paid	(1,970)	(796)
Principal payments on notes payable	(21,250)	(23,492)
Payments on US revolver	(155,000)	(250,000)
Borrowings from US revolver	280,000	330,000
Borrowings from swing line of credit, net		1,000
Borrowings from foreign revolver	53,494
Payments on foreign revolver, net	(44,533)
Other	(255)	(129)
Net cash provided by financing activities	253,605	176,151
Effect of foreign currency exchange rates on cash	(7,257)	9,073
Net increase in cash and cash equivalents	62,040	14,902
Cash and cash equivalents, beginning of period	283,649	285,159
Cash and cash equivalents, end of period	345,689	300,061
Supplemental cash flow information
Cash paid for interest	13,041	10,858
Cash paid for income taxes	$ 84,695	$ 29,428