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Goodwill
12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets, net [Abstract]  
Goodwill

4. Goodwill

The changes in the carrying amount of goodwill as of December 31, 2012 and 2011 consisted of the following (in thousands):

 

                 
     Year Ended
December 31
 
     2012     2011  

Beginning balance

  $ 92,750     $ 79,424  

Goodwill acquired during the year

    10,538       15,887  

Goodwill allocated to specific assets for businesses acquired in 2011

    (3,300     —     

Goodwill allocated to specific assets for businesses acquired in 2010

    —          (2,990

Goodwill adjustments for purchase price allocation of businesses acquired

    200       443  

Goodwill written off—closed clinic

    —          (14
   

 

 

   

 

 

 

Ending balance

  $ 100,188     $ 92,750  
   

 

 

   

 

 

 

In addition to the goodwill resulting from the 2011 acquisitions, for 2011, the goodwill acquired includes $1.5 million related to additional consideration based on the achievement of operating results for the third year of operations of an acquisition which occurred in 2008. Due to the timing of the acquisition, current accounting regulations required the amounts paid be capitalized as goodwill. These amounts are tax deductible.