CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES
Net income	$ 243,684	$ 211,783
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	32,682	29,349
Provision for doubtful accounts	9,053	11,128
Stock-based compensation	31,019	16,423
Deferred income taxes	(1,780)	5,894
Gain on divestiture	0	(1,848)
Loss on sale/disposal of assets	438	500
Changes in operating elements (net of acquisitions):
Receivables	(87,663)	(261,334)
Prepaid expenses and other	(19,802)	(14,214)
Other non-current assets	736	270
Accounts payable and outstanding checks	56,891	121,109
Accrued compensation and profit-sharing contribution	(32,027)	(6,137)
Accrued income taxes	21,230	12,698
Other accrued liabilities	(3,265)	2,747
Net cash provided by operating activities	251,196	128,368
INVESTING ACTIVITIES
Purchases of property and equipment	(11,542)	(14,860)
Purchases and development of software	(8,063)	(3,964)
Acquisitions, net of cash acquired	(369,143)	0
Restricted cash	359,388	0
Other	361	268
Net cash used for investing activities	(28,999)	(18,556)
FINANCING ACTIVITIES
Proceeds from stock issued for employee benefit plans	9,858	7,417
Stock tendered for payment of withholding taxes	(10,190)	(11,288)
Repurchase of common stock	(89,923)	(48,869)
Cash dividends	(114,517)	(104,909)
Excess tax benefit on stock-based compensation	6,040	5,198
Proceeds from short-term borrowings	3,893,000	2,435,000
Payments on short-term borrowings	(3,868,000)	(2,410,000)
Net cash used for financing activities	(173,732)	(127,451)
Effect of exchange rates on cash	(5,954)	(193)
Net increase (decrease) in cash and cash equivalents	42,511	(17,832)
Cash and cash equivalents, beginning of period	128,940	$ 162,047
Cash and cash equivalents, end of period	$ 171,451