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Goodwill (Tables)
12 Months Ended
Dec. 31, 2013
Goodwill  
Schedule of amounts for goodwill and changes to carrying value by operating segment
 
  Region
One
  Region
Two
  Region
Three
  Region
Four
  Region
Five
  Total  

Balance as of December 31, 2011

  $ 65,697   $ 3,760   $ 37,097   $ 22,577   $ 3,286   $ 132,417  

Goodwill acquired during the period

    127,782     28,485     28,893     40,044     81,395     306,599  

Contingent payments for businesses acquired

    279         53             332  

Foreign currency translation

            138             138  
                           

Balance as of December 31, 2012

  $ 193,758   $ 32,245   $ 66,181   $ 62,621   $ 84,681   $ 439,486  
                           
                           

Contingent payments related to acquisitions

  $ 342   $   $   $   $   $ 342  

Foreign currency translation

            (325 )           (325 )
                           

Balance as of December 31, 2013

  $ 194,100   $ 32,245   $ 65,856   $ 62,621   $ 84,681   $ 439,503