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Segment Information (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Depreciation of PP&E:      
Total depreciation of PP&E $ 18,762 $ 17,329 $ 15,601
Additions to PP&E:      
Total additions to PP&E 47,957 36,545 31,336
Total assets at December 31:      
Total assets 502,009 387,981 338,633
Climate Control [Member]
      
Depreciation of PP&E:      
Total depreciation of PP&E 3,853 4,026 4,077
Additions to PP&E:      
Total additions to PP&E 5,746 7,177 6,438
Total assets at December 31:      
Total assets 119,323 112,894 102,029
Chemical [Member]
      
Depreciation of PP&E:      
Total depreciation of PP&E 14,659 13,154 11,291
Additions to PP&E:      
Total additions to PP&E 39,835 28,850 24,627
Total assets at December 31:      
Total assets 214,246 179,033 143,800
Corporate assets and other [Member]
      
Depreciation of PP&E:      
Total depreciation of PP&E 250 149 233
Additions to PP&E:      
Total additions to PP&E 2,376 518 271
Total assets at December 31:      
Total assets $ 168,440 $ 96,054 $ 92,804