CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net income	$ 152,779	$ 114,407
Adjustments to reconcile net income to net cash used for operating activities:
Fair value change of fuel price derivatives	(14,140)	(1,234)
Stock-based compensation	10,089	6,882
Depreciation, amortization and impairment	51,658	45,021
Gain on divestiture	(27,169)	0
Deferred taxes	25,190	23,207
Provision for credit losses	23,154	13,686
Loss on disposal of property, equipment and capitalized software	1,138	637
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	(389,339)	(384,715)
Other assets	(42,455)	(39,289)
Accounts payable	201,506	185,284
Accrued expenses	19,203	13,030
Income taxes	(6,757)	5,463
Other liabilities	(1,724)	(826)
Amounts due under tax receivable agreement	(5,772)	(6,841)
Net cash used for operating activities	(2,639)	(25,288)
Cash flows from investing activities
Purchases of property, equipment and capitalized software	(39,403)	(30,122)
Purchases of available-for-sale securities	(2,740)	(1,704)
Maturities of available-for-sale securities	279	1,065
Acquisitions and investments, net of cash	591,791	0
Proceeds from sale of subsidiary	46,890	0
Net cash used for investing activities	(586,765)	(30,761)
Cash flows from financing activities
Excess tax benefits from equity instrument share-based payment arrangements	1,432	6,509
Repurchase of share-based awards to satisfy tax withholdings	(3,342)	(10,917)
Proceeds from stock option exercises	235	1,671
Net change in deposits	379,812	267,859
Net change in borrowed federal funds	0	(48,400)
Other debt	47,798	(3,003)
Loan origination fee	(3,309)	(12,023)
Borrowings on notes outstanding	0	400,000
Purchase of shares of treasury stock	(19,765)	(17,911)
Net cash provided by financing activities	801,686	251,535
Effect of exchange rate changes on cash and cash equivalents	2,938	(1,977)
Net change in cash and cash equivalents	215,220	193,509
Cash and cash equivalents, beginning of period	361,486	197,662
Cash and cash equivalents, end of period	576,706	391,171
Supplemental cash flow information
Interest paid	31,757	20,291
Income taxes paid	49,504	33,013
2011 term loan
Cash flows from financing activities
Net activity on term loans	0	(182,500)
2013 term loan
Cash flows from financing activities
Net activity on term loans	(14,375)	288,750
2014 term loan
Cash flows from financing activities
Net activity on term loans	222,500	0
UNIK
Significant non-cash transactions
Increase in UNIK estimated earn out	0	198
2011 revolving line-of-credit
Cash flows from financing activities
Net activity on credit facility	0	(438,500)
2014 revolving credit facility
Cash flows from financing activities
Net activity on credit facility	$ 190,700	$ 0