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Accounts Receivable
 12 Months Ended
Dec. 31, 2011
Accounts Receivable  
Accounts Receivable

5. Accounts Receivable

        Accounts receivable consisted of the following at December 31:

(in thousands)
   2011   2010  

Contract receivables

   $ 99,121   $ 81,968  

Contract retainages

     28,299     25,930  

Other

     569     221  
           

 

     127,989     108,119  

Less: Allowance for doubtful accounts

     (1,078 )   (947 )
           

 

   $ 126,911   $ 107,172  
           

        The roll-forward activity of allowance for doubtful accounts was as follows for the years ended December 31:

(in thousands)
   2011   2010   2009  

Balance at beginning of period

   $ (947 ) $ (1,114 ) $ (1,845 )

Reduction in (provision for) allowances

     (159 )   161     718  

Write offs, net of recoveries

     28     6     13  
               

Balance at end of period

   $ (1,078 ) $ (947 ) $ (1,114 )