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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Segment Financial Information    
Net sales $ 190,245 $ 177,493
Gross profit 44,444 53,854
Total operating income 23,082 34,037
Interest expense (1,132) (1,712)
Non-operating income (expense), net 5 7
Provisions for income taxes (7,802) (11,657)
Equity in earnings of affiliate - Climate Control 171 285
Income from continuing operations 14,324 20,960
Climate Control [Member]
    
Segment Financial Information    
Net sales 62,758 63,649
Gross profit 19,446 21,486
Total operating income 5,838 8,441
Non-operating income (expense), net   1
Chemical [Member]
    
Segment Financial Information    
Net sales 124,205 111,431
Gross profit 23,998 31,468
Total operating income 20,347 29,098
Other [Member]
    
Segment Financial Information    
Net sales 3,282 2,413
Gross profit 1,000 900
Total operating income (3,103) (3,502)
Non-operating income (expense), net $ 5 $ 6