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Quarterly Results (Unaudited) (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	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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Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings.

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The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.

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Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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