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Segment Information (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Financial Information        
Net sales $ 182,374,000 $ 176,780,000 $ 581,894,000 $ 589,892,000
Gross profit 33,187,000 34,257,000 143,366,000 160,197,000
Operating income 11,889,000 12,492,000 77,294,000 94,803,000
Interest expense (1,489,000) (1,901,000) (3,800,000) (5,481,000)
Losses on extinguishment of debt       (136,000)
Non-operating other income (expense), net (2,000) (2,000) 270,000 3,000
Provisions for income taxes (3,857,000) (4,433,000) (27,110,000) (33,582,000)
Equity in earnings (losses) of affiliate-Climate Control 169,000 168,000 510,000 375,000
Income from continuing operations 6,710,000 6,324,000 47,164,000 55,982,000
Segment Information (Textual) [Abstract]        
Gain on business interruption insurance recovery       8,600,000
Climate Control [Member]
        
Segment Financial Information        
Net sales 67,982,000 71,804,000 198,286,000 212,628,000
Gross profit 20,457,000 22,808,000 60,892,000 67,689,000
Operating income 6,856,000 8,738,000 20,007,000 26,357,000
Non-operating other income (expense), net 1,000   1,000 1,000
Chemical [Member]
        
Segment Financial Information        
Net sales 110,212,000 102,769,000 372,551,000 369,820,000
Gross profit 11,291,000 10,677,000 78,789,000 89,789,000
Operating income 7,529,000 7,105,000 67,023,000 78,923,000
Non-operating other income (expense), net 1,000   1,000 1,000
Other [Member]
        
Segment Financial Information        
Net sales 4,180,000 2,207,000 11,057,000 7,444,000
Gross profit 1,439,000 772,000 3,685,000 2,719,000
Operating income (2,496,000) (3,351,000) (9,736,000) (10,477,000)
Non-operating other income (expense), net $ (4,000) $ (2,000) $ 268,000 $ 1,000