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Segment Information (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Financial Information        
Net sales $ 209,275,000 $ 235,619,000 $ 399,520,000 $ 413,112,000
Gross profit 65,735,000 72,086,000 110,179,000 125,940,000
Operating income 42,323,000 48,274,000 65,405,000 82,311,000
Interest expense (1,179,000) (1,868,000) (2,311,000) (3,580,000)
Losses on extinguishment of debt   (136,000)   (136,000)
Non-operating other income (expense), net 267,000 (2,000) 272,000 5,000
Provisions for income taxes (15,451,000) (17,492,000) (23,253,000) (29,149,000)
Equity in earnings (losses) of affiliate-Climate Control 170,000 (78,000) 341,000 207,000
Income from continuing operations 26,130,000 28,698,000 40,454,000 49,658,000
Segment Information (Textual) [Abstract]        
Gain on business interruption insurance recovery   8,600,000   8,600,000
Climate Control [Member]
        
Segment Financial Information        
Net sales 67,546,000 77,175,000 130,304,000 140,824,000
Gross profit 20,989,000 23,395,000 40,435,000 44,881,000
Operating income 7,313,000 9,178,000 13,151,000 17,619,000
Non-operating other income (expense), net       1,000
Chemical [Member]
        
Segment Financial Information        
Net sales 138,134,000 155,620,000 262,339,000 267,051,000
Gross profit 43,500,000 47,644,000 67,498,000 79,112,000
Operating income 39,147,000 42,720,000 59,494,000 71,818,000
Non-operating other income (expense), net   1,000   1,000
Other [Member]
        
Segment Financial Information        
Net sales 3,595,000 2,824,000 6,877,000 5,237,000
Gross profit 1,246,000 1,047,000 2,246,000 1,947,000
Operating income (4,137,000) (3,624,000) (7,240,000) (7,126,000)
Non-operating other income (expense), net $ 267,000 $ (3,000) $ 272,000 $ 3,000