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Detail of Certain Balance Sheet Accounts (Tables)
 12 Months Ended
Dec. 31, 2013
Detail of Certain Balance Sheet Accounts  
Schedule of activity in allowance for doubtful accounts

Activity in our allowance for doubtful accounts consists of the following (in thousands):

 
   December 31,  
 
   2013   2012   2011  

Balance at beginning of year

   $ 6,333   $ 4,615   $ 5,029  

Additions for bad debt expense

     19     2,753     214  

Deductions for uncollectible receivables written off, net of recoveries

     (1,892 )   (1,090 )   (770 )

Allowance for doubtful accounts of acquired companies at date of acquisition

     —     55     142  
               
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Balance at end of year

   $ 4,460   $ 6,333   $ 4,615  
               
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Schedule of other current liabilities

Other current liabilities consist of the following (in thousands):

 
   December 31,  
 
   2013   2012  

Accrued warranty costs

   $ 6,795   $ 6,781  

Accrued job losses

     758     2,137  

Accrued rent and lease obligations

     673     673  

Accrued sales and use tax

     1,821     1,710  

Deferred revenue

     1,320     1,143  

Liabilities due to former owners

     4,054     2,349  

Other current liabilities

     12,747     12,284  
           
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   $ 28,168   $ 27,077  
           
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