Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities
Net income	$ 163,658	$ 137,761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	9,673	8,054
Stock-based compensation	18,299	8,059
Provision for losses on accounts receivable	12,283	9,199
Amortization of deferred financing costs	1,062	1,593
Amortization of intangible assets	36,482	19,239
Amortization of premium on receivables	1,630	1,632
Deferred income taxes	2,032	(2,598)
Equity method investment loss	1,489
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	2,092	5,199
Accounts receivable	(197,667)	(190,998)
Prepaid expenses and other current assets	(8,285)	1,392
Other assets	(389)	39,322
Excess tax benefits related to stock-based compensation	(18,634)	(12,016)
Accounts payable, accrued expenses and customer deposits	133,996	56,874
Net cash provided by operating activities	157,721	82,712
Investing activities
Acquisitions, net of cash acquired	(189,850)	(156,956)
Purchases of property and equipment	(11,552)	(10,108)
Net cash used in investing activities	(201,402)	(167,064)
Financing activities
Excess tax benefits related to stock-based compensation	18,634	12,016
Proceeds from issuance of common stock	8,277	12,511
Borrowings on securitization facility, net	75,400	104,000
Deferred financing costs paid	(546)	(1,967)
Principal payments on notes payable	(13,750)	(14,375)
Payments on revolver - A Facility	(262,377)	(70,000)
Borrowings from revolver - A Facility	142,330	55,000
Payments on foreign revolver - B Facility	(7,337)	(13,821)
Borrowings from foreign revolver - B Facility		26,895
Borrowings from swing line of credit, net	41,522
Other	(371)	(175)
Net cash provided by financing activities	1,782	110,084
Effect of foreign currency exchange rates on cash	1,436	(16,476)
Net (decrease) increase in cash and cash equivalents	(40,463)	9,256
Cash and cash equivalents, beginning of period	338,105	283,649
Cash and cash equivalents, end of period	297,642	292,905
Supplemental cash flow information
Cash paid for interest	12,797	8,262
Cash paid for income taxes	$ 52,697	$ 60,120