Commitments and Contingencies - Natural Gas Gathering Agreement (Details) (Gas Gathering Agreement, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Gas Gathering Agreement
Years ending December 31
2013	$ 42,634
2014	42,360
2015	42,153
2016	42,091
2017	41,812
Thereafter	141,775
Total future obligation	$ 352,825

Contractual Commitments Future Minimum Payments Due Total

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Contractual Commitments Future Minimum Payments Due Current

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Contractual Commitments Future Minimum Payments Due In Five Years

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Contractual Commitments Future Minimum Payments Due In Four Years

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Contractual Commitments Future Minimum Payments Due In Three Years

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Contractual Commitments Future Minimum Payments Due In Two Years

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Contractual Commitments Future Minimum Payments Due Thereafter

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