CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES
Net income	$ 215,215	$ 221,082
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	27,952	17,208
Provision for doubtful accounts	5,635	3,608
Stock-based compensation	9,885	16,559
Deferred income taxes	25,993	3,543
Loss on sale/disposal of assets	138	2,397
Other long-term liabilities	5	17
Changes in operating elements, net of effects of acquisitions:
Receivables	(198,669)	(229,361)
Prepaid expenses and other	(12,146)	(5,631)
Accounts payable and outstanding checks	100,481	130,457
Accrued compensation and profit-sharing contribution	(35,277)	(51,556)
Accrued income taxes	(69,631)	9,058
Other accrued liabilities	(11,310)	(7,353)
Net cash provided by operating activities	58,271	110,028
INVESTING ACTIVITIES
Purchases of property and equipment	(18,316)	(17,403)
Purchases and development of software	(4,261)	(7,567)
Payments to Acquire Businesses, Net of Cash Acquired	19,126	0
Other	107	192
Net cash used for investing activities	(3,344)	(24,778)
FINANCING ACTIVITIES
Proceeds from stock issued for employee benefit plans	10,298	10,736
Stock tendered for payment of withholding taxes	(47,909)	(8,020)
Payment of contingent purchase price	(927)	(11,613)
Repurchase of common stock	(96,432)	(105,483)
Cash dividends	(113,031)	(109,151)
Excess tax benefit on stock-based compensation	24,755	7,654
Proceeds from short-term borrowings	2,134,023	0
Payments on short-term borrowings	(2,022,017)	0
Net cash used for financing activities	(111,240)	(215,877)
Effect of exchange rates on cash	(3,689)	(2,415)
Net decrease in cash and cash equivalents	(60,002)	(133,042)
Cash and cash equivalents, beginning of period	210,019	373,669
Cash and cash equivalents, end of period	$ 150,017	$ 240,627