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Other Income (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Summary of Other Income |  |  |
Volatile organic compound emission plant lease income | $ 2,900 | $ 4,714 | $ 6,892
Gain on sale of marketable securities | (2,906) | (1,805) |
Miscellaneous income | 6,088 | 1,008 | 6,635
Other income | $ 12,360 | $ 7,527 | $ 13,527

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