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Receivables
9 Months Ended
Sep. 30, 2011
Receivables [Abstract] 
Receivables
2. Receivables
Receivables consist of the following:
                 
    September 30,     December 31,  
    2011     2010  
    (in thousands)  
Trade receivables
  $ 32,175     $ 30,728  
Less: allowance for doubtful accounts
    (589 )     (585 )
 
           
 
    31,586       30,143  
Recoverable income taxes
    50       68  
Other
    571       542  
 
           
 
  $ 32,207     $ 30,753