Commitments And Contingencies (Future Minimum Transportation Fees) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Commitments And Contingencies [Abstract]
2012	$ 151,640
2013	217,617
2014	262,888
2015	311,529
2016	329,379
Thereafter	$ 1,069,159

Transportation Fees Future Minimum Payments Due Current

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Transportation Fees Future Minimum Payments Due In Five Years

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Transportation Fees Future Minimum Payments Due In Four Years

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Transportation Fees Future Minimum Payments Due In More Than Five Years

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Transportation Fees Future Minimum Payments Due In Three Years

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Transportation Fees Future Minimum Payments Due In Two Years

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