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Accrued Liabilities Other
 6 Months Ended
Jun. 30, 2011
Accrued Liabilities-Other [Abstract]  
Accrued Liabilities Other
10. Accrued Liabilities — Other
Accrued liabilities — other consist of the following:
                 
    June 30,     December 31,  
    2011     2010  
    (in thousands)  
Taxes (other than income) and insurance
  $ 387     $ 556  
Commissions
    628       707  
Litigation and legal fees
    173       151  
Other professional fees
    535       659  
Environmental
    2,816       3,132  
Warranty
    1,399       1,553  
Deferred revenue
    138       78  
Other
    1,645       1,778  
 
           
 
  $ 7,721     $ 8,614  
 
           
A liability is established for estimated future warranty and service claims that relate to current and prior period sales. The Company estimates warranty costs based on historical claim experience and other factors including evaluating specific product warranty issues.
Included in the environmental accrual are estimates for all known costs believed to be probable and reasonably estimable for sites that the Company currently operates or operated at one time (see Note 12 for additional information).
The following is a summary of activity in accrued warranty and service liabilities:
         
    Six Months Ended  
    June 30, 2011  
    (in thousands)  
Liability, beginning of year
  $ 1,553  
Expense for new warranties issued
    323  
Warranty claims
    (477 )
 
     
Liability, end of period
  $ 1,399