Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 63,130	$ 20,656
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	79	315
Depreciation expense	25,703	28,910
Stock-based compensation expense-restricted stock and stock units	25,447	28,969
Stock-based compensation expense-stock options		155
Excess tax benefits from stock-based compensation	(944)	(709)
Provision for deferred income taxes	(6,781)	(7,182)
Provision for doubtful accounts receivable	2,309	2,101
Changes in assets and liabilities:
Increase in accounts receivable	(65,517)	(35,275)
Increase (decrease) in accounts payable, accrued expenses, accrued payroll costs and retirement obligations	17,479	(1,555)
Increase in income taxes payable	28,770	7,899
Change in other assets, net of change in other liabilities	(1,793)	6,700
Net cash flows provided by operating activities	87,882	50,984
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(28,375)	(14,412)
(Increase) decrease in trusts for employee benefits and retirement plans	(2,785)	609
Net cash flows used in investing activities	(31,160)	(13,803)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repurchases of common stock	(91,545)	(71,761)
Cash dividends paid	(40,307)	(38,634)
Decrease in notes payable and other indebtedness	(60)	(55)
Excess tax benefits from stock-based compensation	944	709
Proceeds from exercises of stock options	13,693	5,385
Net cash flows used in financing activities	(117,275)	(104,356)
Effect of exchange rate changes on cash and cash equivalents	6,487	(8,575)
Net decrease in cash and cash equivalents	(54,066)	(75,750)
Cash and cash equivalents at beginning of period	315,137	365,794
Cash and cash equivalents at end of period	261,071	290,044
Cash paid during the period for:
Interest	273	301
Income taxes, net of refunds	$ 19,251	$ 12,840