Commitments and Contingencies (Details) (USD $) In Thousands	Sep. 30, 2011
Future minimum transportation fees
2011 (remaining)	$ 22,880
2012	91,235
2013	90,588
2014	90,113
2015	87,182
Thereafter	510,508
Total	$ 892,506

Transportation commitments future minimum transportation fees due.

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Transportation commitments future minimum transportation fees due.

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Transportation commitments future minimum transportation fees due in remainder of fiscal year.

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Transportation commitments future minimum transportation fees due in year four.

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Transportation commitments future minimum transportation fees due in year one.

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Transportation commitments future minimum transportation fees due in year three.

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Transportation commitments future minimum transportation fees due in year two.

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Transportation commitments future minimum transportation fees due thereafter.

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