Commitments and Contingencies (Details) (USD $) In Thousands	Jun. 30, 2011
Future minimum transportation fees
2011 (remaining)	$ 45,315
2012	90,361
2013	89,768
2014	88,826
2015	86,361
Thereafter	503,940
Total	$ 904,571

Transportation commitments future minimum transportation fees due.

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Transportation commitments future minimum transportation fees due abstract.

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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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