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Inventories
 12 Months Ended
Dec. 31, 2011
Inventory [Abstract]  
Inventories
4. Inventories
                                 
    Finished     Work-in-     Raw        
    Goods     Process     Materials     Total  
    (In Thousands)  
December 31, 2011:
                               
Climate Control products
  $ 6,871     $ 4,855     $ 21,579     $ 33,305  
Chemical products
    18,509       —       4,063       22,572  
Industrial machinery and components
    3,629       —       —       3,629  
 
                       
 
  $ 29,009     $ 4,855     $ 25,642     $ 59,506  
 
                       
 
                               
December 31, 2010:
                               
Climate Control products
  $ 7,486     $ 2,981     $ 18,252     $ 28,719  
Chemical products
    21,161       —       6,801       27,962  
Industrial machinery and components
    3,425       —       —       3,425  
 
                       
 
  $ 32,072     $ 2,981     $ 25,053     $ 60,106  
 
                       
At December 31, 2011 and 2010, inventory reserves for certain slow-moving inventory items (Climate Control products) were $1,767,000 and $1,616,000, respectively. In addition, because cost exceeded the net realizable value, inventory reserves for certain nitrogen-based inventories provided by our Chemical Business were $16,000 and $177,000 at December 31, 2011 and 2010, respectively.
Changes in our inventory reserves are as follows:
                         
    2011     2010     2009  
    (In Thousands)  
 
Balance at beginning of year
  $ 1,793     $ 1,676     $ 4,141  
Provisions for (realization of) losses
    590       184       (2,404 )
Write-offs and disposals
    (600 )     (67 )     (61 )
 
                 
Balance at end of year
  $ 1,783     $ 1,793     $ 1,676  
 
                 
The provisions for (realization of) losses are included in cost of sales in the accompanying consolidated statements of income.