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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2013
Accounts Receivable  
Schedule of accounts receivable

 

 

(in thousands)
   2013   2012  

Contract receivables

   $ 113,572   $ 112,316  

Contract retainages

     60,694     56,053  

Other

     334     177  
           
​ ​ ​ ​ ​ ​ ​ ​

 

     174,600     168,546  

Less: Allowance for doubtful accounts

     (1,132 )   (1,305 )
           
​ ​ ​ ​ ​ ​ ​ ​

 

   $ 173,468   $ 167,241  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of roll-forward activity of allowance for doubtful accounts

 

 

(in thousands)
   2013   2012  

Balance at beginning of period

   $ (1,305 ) $ (1,078 )

Reduction in (provision for) allowances

     159     (383 )

Write offs, net of recoveries

     14     156  
           
​ ​ ​ ​ ​ ​ ​ ​

Balance at end of period

   $ (1,132 ) $ (1,305 )
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​