Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
OPERATING ACTIVITIES
Net income	$ 208,051	$ 181,238
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	22,609	12,381
Depreciation and amortization	15,299	14,701
Provision for doubtful accounts	4,062	7,059
Deferred taxes and other	(618)	10,592
Changes in operating elements:
Receivables	(279,205)	(271,091)
Prepaid expenses and other	(8,451)	(7,816)
Accounts payable and outstanding checks	130,693	91,224
Accrued compensation and profit-sharing contribution	(19,451)	(34,705)
Accrued income taxes and other	5,865	6,290
Net cash provided by operating activities	78,854	9,873
INVESTING ACTIVITIES
Purchases of property and equipment	(11,733)	(7,988)
Purchases and development of software	(8,052)	(4,757)
Purchases of available-for-sale-securities	0	(10,752)
Sales/maturities of available-for-sale-securities	9,311	12,990
Restricted cash	0	(5,000)
Other investing activities	5	(27)
Net cash used for investing activities	(10,469)	(15,534)
FINANCING ACTIVITIES
Payment of contingent purchase price	(4,318)	0
Proceeds from stock issued for employee benefit plans	4,916	8,909
Repurchase of common stock	(64,499)	(89,141)
Excess tax benefit on stock-based compensation	11,053	4,297
Cash dividends	(97,562)	(84,636)
Net cash used for financing activities	(150,410)	(160,571)
Effect of exchange rates on cash	(685)	(4,951)
Net change in cash and cash equivalents	(82,710)	(171,183)
Cash and cash equivalents, beginning of period	398,607	337,308
Cash and cash equivalents, end of period	$ 315,897	$ 166,125