Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities
Net income	$ 75,109	$ 64,662
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	4,801	4,031
Stock-based compensation	10,612	4,162
Provision for losses on accounts receivable	5,554	4,460
Amortization of deferred financing costs	531	760
Amortization of intangible assets	18,272	9,022
Amortization of premium on receivables	814	816
Deferred income taxes	603	(1,012)
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	1,404	4,327
Accounts receivable	(153,184)	(192,483)
Prepaid expenses and other current assets	(7,111)	3,194
Other assets	545	40,113
Excess tax benefits related to stock-based compensation	(16,126)	(5,843)
Accounts payable, accrued expenses and customer deposits	109,670	50,101
Net cash provided by (used in) operating activities	51,494	(13,690)
Investing activities
Acquisitions, net of cash acquired	(19,292)	(94,773)
Purchases of property and equipment	(5,584)	(4,762)
Net cash used in investing activities	(24,876)	(99,535)
Financing activities
Excess tax benefits related to stock-based compensation	16,126	5,843
Proceeds from issuance of common stock	4,512	5,256
Borrowings on securitization facility, net	44,500	87,000
Deferred financing costs paid	(521)	(1,830)
Principal payments on notes payable	(6,875)	(7,500)
Payments on revolver - A Facility	(134,803)	(25,000)
Payments on foreign revolver - B Facility	(3,601)
Borrowings from swing line of credit, net	15
Other	(246)	(178)
Net cash (used in) provided by financing activities	(80,893)	63,591
Effect of foreign currency exchange rates on cash	(456)	(9,402)
Net decrease in cash and cash equivalents	(54,731)	(59,036)
Cash and cash equivalents, beginning of period	338,105	283,649
Cash and cash equivalents, end of period	283,374	224,613
Supplemental cash flow information
Cash paid for interest	6,264	3,863
Cash paid for income taxes	$ 20,865	$ 38,426