Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities
Net income	$ 96,480	$ 69,049
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation	6,288	5,531
Stock-based compensation	7,793	11,983
Provision for losses on accounts receivable	10,953	8,771
Amortization of deferred financing costs	1,051	843
Amortization of intangible assets	14,357	9,187
Amortization of premium on receivables	1,633	1,634
Deferred income taxes	(167)	(765)
Loss on early extinguishment of debt		2,669
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	5,635	(667)
Accounts receivable	(117,325)	(154,408)
Prepaid expenses and other current assets	2,808	(4,608)
Other assets	(42,268)	(1,114)
Excess tax benefits related to stock-based compensation	(14,750)	(1,821)
Accounts payable, accrued expenses and customer deposits	(9,286)	56,170
Net cash (used in) provided by operating activities	(36,798)	2,454
Investing activities
Acquisitions, net of cash acquired	(35,490)	(785)
Purchases of property and equipment	(8,431)	(5,916)
Net cash used in investing activities	(43,921)	(6,701)
Financing activities
Excess tax benefits related to stock-based compensation	14,750	1,821
Borrowings on securitization facility, net	45,000	18,000
Deferred financing costs paid	(795)	(7,736)
Proceeds from issuance of common stock	11,584	855
Principal payments on notes payable	(7,500)	(331,465)
Borrowings on notes payable		300,000
Principal payments on revolver	(185,000)
Borrowings from revolver	145,000
Borrowings (payments) on swing line of credit, net	26,862
Other		(179)
Net cash provided by (used in) financing activities	49,901	(18,704)
Effect of foreign currency exchange rates on cash	1,238	9,347
Net decrease in cash and cash equivalents	(29,580)	(13,604)
Cash and cash equivalents, beginning of period	285,159	114,804
Cash and cash equivalents, end of period	255,579	101,200
Supplemental cash flow information
Cash paid for interest	7,209	4,335
Cash paid for income taxes	$ 24,164	$ 20,284