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Receivables (Tables)
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Schedule of Activity in Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts for the years ended December 31, 2013, 2012 and 2011 was as follows:

 

      Year Ended December 31,  
         2013              2012             2011      

Balance, January 1

    $ 23,017       $ 19,450      $ 15,017   

Bad debt expense

      4,395         6,579        7,952   

Charge-offs, foreign currency translation and other adjustments

      1,365         (3,012 )      (3,519 ) 
  

 

 

     

 

 

    

 

 

  

Balance, December 31

    $ 28,777       $ 23,017      $ 19,450