Condensed Consolidated Statement Of Cash Flows (USD $) In Thousands	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net earnings	$ 84,947	$ 56,180
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	14,892	10,973
Amortization of discount or premium of investments	600	670
Share-based compensation	6,672	8,767
Excess tax benefits from share-based compensation	(13,246)	(164)
Provision for doubtful accounts	4,963	1,542
Deferred income taxes	5,394	(815)
Decrease (increase) in:
Accounts receivable	(7,074)	(1,354)
Prepaid expenses and other current assets	3,811	1,097
Other assets	153	(262)
(Decrease) increase in:
Accounts payable and accrued expenses	(1,112)	2,350
Income taxes payable	8,885	(11,426)
Deferred revenue	9,723	(422)
Liability for uncertain tax positions	(9,668)	6,339
Other	293	677
Net cash provided by operating activities	109,233	74,152
Cash flows from investing activities:
Maturity of certificates of deposits		31,653
Purchase of certificate of deposit	(8,000)
Redemptions/sales of available-for-sale investments	20,127	9,019
Purchase of available-for-sale investments	(50,192)	(52,921)
Purchases of property and equipment	(5,075)	(1,273)
Proceeds from sale of assets	4
Acquisition of businesses, net of cash received	(3,244)	(36,546)
Purchases of intangible assets	(2,616)	(6,953)
Net cash (used in) investing activities	(48,996)	(57,021)
Cash flows from financing activities:
Repurchases of common stock and restricted stock	(1,273)	(4,175)
Issuance of common stock under employee stock purchase plan	110	85
Exercise of stock options	7,001	2,349
Dividends paid	(9,463)
Excess tax benefits from share-based compensation	13,246	164
Net cash provided by (used in) financing activities	9,621	(1,577)
Effect of exchange rate changes on cash and cash equivalents	(420)	(265)
Net increase in cash and cash equivalents	69,438	15,289
Cash and cash equivalents at beginning of period	64,752	197,411
Cash and cash equivalents at end of period	$ 134,190	$ 212,700

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified equity-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element reduces net cash provided by operating activities.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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