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Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Summary of changes in carrying amount of goodwill
Beginning balance	$ 92,750	$ 79,424
Goodwill acquired during the year	10,538	15,887
Goodwill allocated to specific assets for business acquired in 2011	(3,300)
Goodwill allocated to specific assets for business acquired in 2010		(2,990)
Goodwill adjustments for purchase price allocation of business acquired	200	443
Goodwill Written Off - Closed clinic		(14)
Ending balance	$ 100,188	$ 92,750

X

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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X

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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



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Purchase price allocation adjustment for allocation not yet complete at the prior year end.

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- Definition

Write-off of the carrying amount of indefinite-lived intangible assets associated with all or a portion of a reporting unit that is sold in the period.

+ References

No definition available.

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Goodwill acquired related to business acquisition.

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Goodwill allocated to specific assets.

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