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Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2014
Receivables [Abstract]  
Summary of Accounts Receivable

 

     March 31,
2014
    December 31,
2013
 

Trade receivables

   $ 19,228      $ 18,815   

Contract receivables

     24,955        26,249   

Allowance for doubtful accounts

     (737     (700
  

 

 

   

 

 

 
   $ 43,446      $ 44,364