Commitments and Contingencies - Firm Transportation Contracts and Throughput Agreements (Details) (Transportation And Throughput Agreements, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Transportation And Throughput Agreements
Years ending December 31
2013	$ 26,653
2014	19,671
2015	12,977
2016	11,346
2017	11,315
Thereafter	14,105
Total future obligation	$ 96,067

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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