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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Financial Information
Net sales	$ 805,256	$ 609,905	$ 531,838
Gross profit	223,018	138,625	137,414
Total operating income	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		53	130
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
Climate Control [Member]
Segment Financial Information
Net sales	281,565	250,521	266,169
Gross profit	88,178	86,364	92,409
Total operating income	32,759	35,338	37,706
Non-operating income (expense), net	2	3	8
Climate Control [Member] | Geothermal and water source heat pumps [Member]
Segment Financial Information
Net sales	183,789	171,561	179,865
Climate Control [Member] | Hydronic fan coils [Member]
Segment Financial Information
Net sales	54,379	37,923	46,381
Climate Control [Member] | Other HVAC products [Member]
Segment Financial Information
Net sales	43,397	41,037	39,923
Chemical [Member]
Segment Financial Information
Net sales	511,854	351,086	257,832
Gross profit	130,687	49,295	42,422
Total operating income	116,503	31,948	15,122
Non-operating income (expense), net	1	7	31
Chemical [Member] | Agricultural Products [Member]
Segment Financial Information
Net sales	231,599	135,598	104,300
Chemical [Member] | Industrial acids and other chemical products [Member]
Segment Financial Information
Net sales	161,776	126,846	95,997
Chemical [Member] | Mining Products [Member]
Segment Financial Information
Net sales	118,479	88,642	57,535
Other [Member]
Segment Financial Information
Net sales	11,837	8,298	7,837
Gross profit	4,153	2,966	2,583
Total operating income	(12,819)	(11,361)	(12,118)
Non-operating income (expense), net	$ (3)	$ 43	$ 91

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Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

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