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Impairments and Disposition (Asset Impairment) (Details Textuals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Asset Impairment Charges [Abstract]
Impairments	$ 0	$ 0	$ 1,311
Gain (Loss) on Disposition of Assets [Abstract]
(Gain) loss on sale of property	$ (342)	$ 264	$ (13,881)

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

The gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

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