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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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