Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities:
Net earnings	$ 84,195	$ 80,610
Adjustments to reconcile net earnings to net cash from operating activities:
(Recoveries) provision for losses on accounts receivable	(1,115)	941
Deferred income tax expense	7,194	7,122
Excess tax benefits from stock plans	(489)	(1,099)
Stock compensation expense	10,294	11,005
Depreciation and amortization	12,382	11,278
Other	138	208
Changes in operating assets and liabilities:
Decrease in accounts receivable	12,228	38,856
Increase (decrease) in accounts payable and accrued expenses	29,546	(1,390)
Increase in income taxes payable, net	18,205	18,218
Decrease (increase) in other current assets	1,279	(485)
Net cash from operating activities	173,857	165,264
Investing Activities:
Purchase of short-term investments	(81,130)	0
Proceeds from maturities of short-term investments	20,976	38
Purchase of property and equipment	(8,760)	(10,068)
Other, net	1,670	(444)
Net cash from investing activities	(67,244)	(10,474)
Financing Activities:
Proceeds from issuance of common stock	7,892	10,929
Repurchases of common stock	(226,725)	(17,681)
Excess tax benefits from stock plans	489	1,099
Purchase of noncontrolling interest	0	(7,730)
Distributions to noncontrolling interest	(85)	0
Net cash from financing activities	(218,429)	(13,383)
Effect of exchange rate changes on cash and cash equivalents	(4,790)	(7,562)
(Decrease) increase in cash and cash equivalents	(116,606)	133,845
Cash and cash equivalents at beginning of period	1,247,652	1,260,842
Cash and cash equivalents at end of period	1,131,046	1,394,687
Taxes Paid:
Income taxes	$ 27,496	$ 26,951