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Accounts Receivable, net
 12 Months Ended
Dec. 31, 2011
Accounts Receivable, net [Abstract]  
Accounts Receivable, net
3. Accounts Receivable, net
                 
    December 31,  
    2011     2010  
    (In Thousands)  
Trade receivables
  $ 87,303     $ 73,367  
Other
    1,003       1,528  
 
           
 
    88,306       74,895  
Allowance for doubtful accounts
    (955 )     (636 )
 
           
 
  $ 87,351     $ 74,259  
 
           
Our sales to contractors and independent sales representatives are generally subject to a mechanic’s lien in the Climate Control Business. Sales to other customers are generally unsecured. Credit is extended to customers based on an evaluation of the customer’s financial condition and other factors. Concentrations of credit risk with respect to trade receivables are monitored and this risk is reduced due to the large number of customers comprising our customer bases and their dispersion across many different industries and geographic areas (primarily as it relates to the Climate Control Business) and payment terms of 15 days or less relating to most of our significant customers in the Chemical Business, however, thirteen customers (including their affiliates), primarily relating to the Chemical Business, account for approximately 41% of our total net receivables at December 31, 2011.