Divestitures	12 Months Ended
Dec. 31, 2011
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]
Divestitures	Divestitures On November 7, 2011, we sold substantially all the remaining assets of GCS for a cash price of $4,433. We recorded a gain on the sale of $2,630, which is included in “Other income” on the consolidated statement of operations. On November 28, 2011, we sold certain non-strategic oil and natural gas properties located in our Rocky Mountains area to Charger Resources, LLC for a cash price of approximately $33,100. In accordance with the full cost method of accounting, we reduced our full cost pool by the amount of the net proceeds and did not record a gain or loss on the sale.

Divestitures

12 Months Ended

Dec. 31, 2011

Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]

On November 7, 2011, we sold substantially all the remaining assets of GCS for a cash price of $4,433. We recorded a gain on the sale of $2,630, which is included in “Other income” on the consolidated statement of operations.

On November 28, 2011, we sold certain non-strategic oil and natural gas properties located in our Rocky Mountains area to Charger Resources, LLC for a cash price of approximately $33,100. In accordance with the full cost method of accounting, we reduced our full cost pool by the amount of the net proceeds and did not record a gain or loss on the sale.