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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts  
Valuation and Qualifying Accounts

17. Valuation and Qualifying Accounts

(in thousands)
  Balance at
Beginning of
Year		   Additions
Charged to
Costs and
Expenses		   Deductions,
Write-offs and
Adjustments		   Balance at
End of Year		  

Allowance for doubtful accounts:

                          

Year ended December 31, 2011

   $ 245     23     166   $ 102  
                   
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Year ended December 31, 2012

   $ 102     96     —   $ 198  
                   
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Year ended December 31, 2013

   $ 198     106     21   $ 283  
                   
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