Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (Royalty Agreements [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended
Mar. 31, 2012
Jun. 30, 2012
Maximum [Member]
Jun. 30, 2012
Minimum [Member]
Oil and Gas Delivery Commitments and Contracts [Line Items]      
Royalty payments under settlement agreement   $ 11.0 $ 2.0
Cheniere's purchase price of rights, title and interest in Crest Royalty $ 27.5