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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2015
Receivables [Abstract]  
Summary of Accounts Receivable
(Table only in thousands)    June 30,
2015
     December 31,
2014
 

Trade receivables

   $ 11,562       $ 15,875   

Contract receivables

     55,125         43,218   

Allowance for doubtful accounts

     (920      (699
  

 

 

    

 

 

 
   $ 65,767       $ 58,394