Guarantee	6 Months Ended
Jun. 30, 2011
Guarantee [Abstract]
Guarantee	(15) Guarantee As part of SPN Resources’ acquisition of its oil and gas properties while a wholly-owned subsidiary of the Company, the Company guaranteed SPN Resources’ performance of its decommissioning liabilities. These guarantees remain in place. In accordance with authoritative guidance related to guarantees, the Company has assigned an estimated value of $2.6 million at June 30, 2011 and December 31, 2010 related to decommissioning performance guarantees, which is reflected in other long-term liabilities. The Company believes that the likelihood of being required to perform these guarantees is remote. In the unlikely event that SPN Resources defaults on the decommissioning liabilities, the total maximum potential obligation under these guarantees is estimated to be approximately $109.2 million, net of the contractual right to receive payments from third parties, which is approximately $24.6 million as of June 30, 2011. The total maximum potential obligation will decrease over time as the underlying obligations are fulfilled by SPN Resources.

Guarantee

6 Months Ended

Jun. 30, 2011

(15) Guarantee

As part of SPN Resources’ acquisition of its oil and gas properties while a wholly-owned subsidiary of the Company, the Company guaranteed SPN Resources’ performance of its decommissioning liabilities. These guarantees remain in place. In accordance with authoritative guidance related to guarantees, the Company has assigned an estimated value of $2.6 million at June 30, 2011 and December 31, 2010 related to decommissioning performance guarantees, which is reflected in other long-term liabilities. The Company believes that the likelihood of being required to perform these guarantees is remote. In the unlikely event that SPN Resources defaults on the decommissioning liabilities, the total maximum potential obligation under these guarantees is estimated to be approximately $109.2 million, net of the contractual right to receive payments from third parties, which is approximately $24.6 million as of June 30, 2011. The total maximum potential obligation will decrease over time as the underlying obligations are fulfilled by SPN Resources.