Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities
Net income	$ 137,761	$ 96,480
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	8,054	6,288
Stock-based compensation	8,059	7,793
Provision for losses on accounts receivable	9,199	10,953
Amortization of deferred financing costs	1,593	1,051
Amortization of intangible assets	19,239	14,357
Amortization of premium on receivables	1,632	1,633
Deferred income taxes	(2,598)	(167)
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	5,199	5,635
Accounts receivable	(190,998)	(117,325)
Prepaid expenses and other current assets	1,392	2,808
Other assets	39,322	(42,268)
Excess tax benefits related to stock-based compensation	(12,016)	(14,750)
Accounts payable, accrued expenses and customer deposits	56,874	(9,286)
Net cash provided by (used in) operating activities	82,712	(36,798)
Investing activities
Acquisitions, net of cash acquired	(156,956)	(35,490)
Purchases of property and equipment	(10,108)	(8,431)
Net cash used in investing activities	(167,064)	(43,921)
Financing activities
Excess tax benefits related to stock-based compensation	12,016	14,750
Proceeds from issuance of common stock	12,511	11,584
Borrowings on securitization facility, net	104,000	45,000
Deferred financing costs paid	(1,967)	(795)
Principal payments on notes payable	(14,375)	(7,500)
Payments on US revolver	(70,000)	(185,000)
Borrowings from US revolver	55,000	145,000
Borrowings from swing line of credit, net		26,862
Borrowings from foreign revolver	26,895
Payments on foreign revolver, net	(13,821)
Other	(175)
Net cash provided by financing activities	110,084	49,901
Effect of foreign currency exchange rates on cash	(16,476)	1,238
Net increase (decrease) in cash and cash equivalents	9,256	(29,580)
Cash and cash equivalents, beginning of period	283,649	285,159
Cash and cash equivalents, end of period	292,905	255,579
Supplemental cash flow information
Cash paid for interest	8,262	7,209
Cash paid for income taxes	$ 60,120	$ 24,164