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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
Summary of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill as of December 31, 2013 and 2012 consisted of the following (in thousands):

 

     Year Ended  
     December 31  
     2013     2012  

Beginning balance

    $ 100,188      $ 92,750   

Goodwill acquired during the year

      52,213        10,538   

Goodwill allocated to specific assets for businesses acquired in 2011

      —          (3,300 ) 

Goodwill allocated to specific assets for businesses acquired in 2012

      (2,340 )      —     

Goodwill adjustments for purchase price allocation of businesses acquired

      (48 )      200   

Goodwill written off - sale of physician services business

      (6,058 )      —     
  

 

 

    

 

 

  

Ending balance

    $ 143,955      $ 100,188