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Segment Information (Tables)
12 Months Ended
Dec. 31, 2011
Segment Information [Abstract]  
Segment Financial Information
                         
    2011     2010     2009  
    (In Thousands)  
Net sales:
                       
Climate Control:
                       
Geothermal and water source heat pumps
  $ 183,789     $ 171,561     $ 179,865  
Hydronic fan coils
    54,379       37,923       46,381  
Other HVAC products
    43,397       41,037       39,923  
 
                 
Total Climate Control
    281,565       250,521       266,169  
 
                       
Chemical:
                       
Agricultural products
    231,599       135,598       104,300  
Industrial acids and other chemical products
    161,776       126,846       95,997  
Mining products
    118,479       88,642       57,535  
 
                 
Total Chemical
    511,854       351,086       257,832  
Other
    11,837       8,298       7,837  
 
                 
 
  $ 805,256     $ 609,905     $ 531,838  
 
                 
 
                       
Gross profit:
                       
Climate Control
  $ 88,178     $ 86,364     $ 92,409  
Chemical
    130,687       49,295       42,422  
Other
    4,153       2,966       2,583  
 
                 
 
  $ 223,018     $ 138,625     $ 137,414  
 
                 
 
                       
Operating income:
                       
Climate Control
  $ 32,759     $ 35,338     $ 37,706  
Chemical
    116,503       31,948       15,122  
General corporate expenses and other business operations, net (1)
    (12,819 )     (11,361 )     (12,118 )
 
                 
 
    136,443       55,925       40,710  
Interest expense
    (6,658 )     (7,427 )     (6,746 )
Gain (losses) on extinguishment of debt
    (136 )     (52 )     1,783  
Non-operating income (expense), net:
                       
Climate Control
    2       3       8  
Chemical
    1       7       31  
Corporate and other business operations
    (3 )     43       91  
Provisions for income taxes
    (46,208 )     (19,787 )     (15,024 )
 
                       
Equity in earnings of affiliate — Climate Control
    543       1,003       996  
 
                 
Income from continuing operations
  $ 83,984     $ 29,715     $ 21,849  
 
                 
General corporate expenses and other business operations, net
                         
    2011     2010     2009  
    (In Thousands)  
Gross profit-Other
  $ 4,153     $ 2,966     $ 2,583  
Selling, general and administrative:
                       
Personnel costs
    (8,418 )     (7,865 )     (8,083 )
Professional fees
    (3,805 )     (3,784 )     (3,687 )
All other
    (4,224 )     (3,040 )     (2,917 )
 
                 
Total selling, general and administrative
    (16,447 )     (14,689 )     (14,687 )
 
                       
Other income
    118       366       192  
Other expense
    (643 )     (4 )     (206 )
 
                 
Total general corporate expenses and other business operations, net
  $ (12,819 )   $ (11,361 )   $ (12,118 )
 
                 
PP&E and total assets by business segment
                         
    2011     2010     2009  
    (In Thousands)  
Depreciation of PP&E:
                       
Climate Control
  $ 3,853     $ 4,026     $ 4,077  
Chemical
    14,659       13,154       11,291  
Corporate assets and other
    250       149       233  
 
                 
Total depreciation of PP&E
  $ 18,762     $ 17,329     $ 15,601  
 
                 
 
                       
Additions to PP&E:
                       
Climate Control
  $ 5,746     $ 7,177     $ 6,438  
Chemical
    39,835       28,850       24,627  
Corporate assets and other
    2,376       518       271  
 
                 
Total additions to PP&E
  $ 47,957     $ 36,545     $ 31,336  
 
                 
 
                       
Total assets at December 31:
                       
Climate Control
  $ 119,323     $ 112,894     $ 102,029  
Chemical
    214,246       179,033       143,800  
Corporate assets and other
    168,440       96,054       92,804  
 
                 
Total assets
  $ 502,009     $ 387,981     $ 338,633  
 
                 
Net sales to foreign customers
                         
Geographic Area   2011     2010     2009  
    (In Thousands)  
Canada
  $ 23,765     $ 19,345     $ 20,224  
Middle East
    5,688       6,257       4,440  
Mexico, Central and South America
    2,452       1,411       2,154  
Europe
    2,015       2,373       1,114  
South and East Asia
    1,077       1,635       1,124  
Other
    1,218       835       843  
 
                 
 
  $ 36,215     $ 31,856     $ 29,899