Business Acquisitions (Schedule of Estimated Purchase Price) (Details) (Business Acquisition, Acquiree - IDS [Member], USD $) In Thousands	Sep. 30, 2011
Business Acquisition, Acquiree - IDS [Member]
Cash paid to seller	$ 48,412
Less cash acquired	(1,251)
Total estimated purchase price	47,161
Less marketable securities acquired	(8,463)
Estimated price paid for business assets	$ 38,698

Amount of cash paid to acquire the entity.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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- Definition

The amount of cash and cash equivalents acquired in a business combination.

+ References

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- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, and the fair value of the liabilities assumed. This amount excludes the cash acquired from the aquired entity.

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- Definition

The amount of marketable securities acquired in a business combination. This amount is removed from the cash purchase price to determine the estimated price paid for the business assets acquired in the business combination.

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