(3) Investments in Piceance Energy: Equity Method Investment, Additional Information (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Investment in unconsolidated affiliate	$ 102,292,000	$ 104,434,000
Piceance Energy
Investment in unconsolidated affiliate	102,292,000	104,434,000
(Income) loss from unconsolidated affiliates	(2,360,000)
Increase Decrese In Assets Of Equity Method Investment	$ 218,000

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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+ Details