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(3) Investments in Piceance Energy: Equity Method Investment, Additional Information (Details) (Piceance Energy, USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
(Income) loss from unconsolidated affiliates	$ 1,495	$ (865)
Increase Decrese In Assets Of Equity Method Investment	28	246
Beginning Balance
Equity investment in Piceance Energy	102,292	104,434
Ending Balance
Equity investment in Piceance Energy	$ 103,815	$ 103,815

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.

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