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Schedule II - Valuation And Qualifying Accounts
12 Months Ended
Dec. 31, 2011
Schedule II - Valuation And Qualifying Accounts [Abstract]  
Schedule II - Valuation And Qualifying Accounts

Schedule II - Valuation and Qualifying Accounts

        Additions        
    Balance at   charged to       Balance at
    beginning   costs and       end of
Description   of year   expenses   Deductions   year
Allowance for doubtful accounts                
Year-ended December 31, 2011 –                
Allowance for doubtful accounts $ 58 $ 153 $ 158 $ 53
Year-ended December 31, 2010 –                
Allowance for doubtful accounts $ 207 $ 69 $ 218 $ 58
Year-ended December 31, 2009 –                
Allowance for doubtful accounts $ 397 $ 142 $ 332 $ 207
 
Tax valuation allowance                
Year-ended December 31, 2011 – Tax                
valuation allowance $ 54,513 $ - $ 16,052 $ 38,461
Year-ended December 31, 2010 – Tax                
valuation allowance $ 59,603 $ - $ 5,090 $ 54,513
Year-ended December 31, 2009 – Tax                
valuation allowance $ 59,938 $ - $ 335 $ 59,603