CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES
Net income	$ 93,187	$ 103,343
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation and amortization	14,549	13,807
Provision for doubtful accounts	6,270	2,293
Stock-based compensation	4,793	5,115
Deferred income taxes	6,757	27,303
Gain on divestiture	(1,848)	0
Loss on sale/disposal of assets	372	35
Other long-term liabilities	0	5
Changes in operating elements:
Receivables	(168,723)	(74,267)
Prepaid expenses and other	(16,286)	(12,158)
Other non-current assets	201	0
Accounts payable and outstanding checks	88,052	51,238
Accrued compensation and profit-sharing contribution	(38,008)	(49,920)
Accrued income taxes	32,223	(111,805)
Other accrued liabilities	(7,099)	(13,039)
Net cash provided by (used for) operating activities	14,440	(58,050)
INVESTING ACTIVITIES
Purchases of property and equipment	(11,124)	(8,745)
Purchases and development of software	(1,471)	(1,432)
Other	268	43
Net cash used for investing activities	(12,327)	(10,134)
FINANCING ACTIVITIES
Proceeds from stock issued for employee benefit plans	4,686	7,403
Stock tendered for payment of withholding taxes	(10,950)	(46,933)
Payment of contingent purchase price	0	(927)
Repurchase of common stock	(2,000)	(44,980)
Cash dividends	(52,420)	(56,473)
Excess tax benefit on stock-based compensation	4,253	23,554
Proceeds from short-term borrowings	1,225,000	1,008,000
Payments on short-term borrowings	(1,190,000)	(871,017)
Net cash (used for) provided by financing activities	(21,431)	18,627
Effect of exchange rates on cash	84	(562)
Net decrease in cash and cash equivalents	(19,234)	(50,119)
Cash and cash equivalents, beginning of period	162,047	210,019
Cash and cash equivalents, end of period	$ 142,813	$ 159,900