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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