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Business Combinations (Estimated Acquisition Earn-Out Payables) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Business Combinations [Abstract]
Balance as of January 1	$ 47,715	$ 29,608
Additions to estimated acquisition earn out payables	4,714	8,941
Payments for estimated acquisition earn out payables	(133)	(358)
Change in fair value on estimated acquisition earn-out payables	(970)	(515)
Interest expense accretion	582	416
Net change in earnings from estimated acquisition earn-out payables	(388)	(99)
Balance as of March 31	$ 51,908	$ 38,092

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- Definition

Additions to estimated acquisition earn out payables.

+ References

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Business acquisition earn out payables.

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- Definition

Contingency Payments Earn Out Payables

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- Definition

Contingency payments earn out payables total.

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Payments for estimated acquisition earn out payables.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 143

-Paragraph 13, 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-Name Statement of Financial Accounting Standard (FAS)

-Number 143

-Paragraph 22

-Subparagraph c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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