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Quarterly Results (Unaudited) (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011
Income and earnings per share after tax basis |  |  |  |  |  |  |  |
Early Redemption of Bonds | $ 4,784 |  |  |  | $ (6,065) |  |  |
Alternative Fuel Mixture/Cellulosic Biofuel Credits | (309) | 111 | 4,440 |  |  |  |  |
Gain (losses) on Sale of Plant, Equipment and Timberlands | 834 | 859 | 3,696 |  | 2,266 | 245 | (69) | 1,718
Acquisition Integration Costs |  |  |  |  |  |  | $ (518) | $ (275)

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