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Business Combination (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Langley Acquisition
MMcf
Y
Feb. 02, 2011
Langley Acquisition
Business Combination                          
Cash purchase price                         $ 230,700,000
Capacity of cryogenic natural gas processing plant (in MMcf/d)                       100  
Capacity of refrigeration natural gas processing plant (in MMcf/d)                       75  
Minimum additional capacity of cryogenic natural gas processing plant by mid-2012 (in MMcf/d)                       60  
Purchase price allocation                          
Property, plant and equipment                       136,525,000  
Goodwill                       58,497,000  
Intangibles asset                       33,900,000  
Inventory                       1,806,000  
Total                       230,728,000  
Estimated remaining useful life of intangibles (in years)                       12  
Revenue                 1,534,434,000 1,241,563,000 858,635,000 21,800,000  
Net income $ (61,743,000) $ 153,454,000 $ 89,205,000 $ (74,671,000) $ (43,194,000) $ (18,676,000) $ 66,968,000 $ 26,004,000 $ 106,245,000 $ 31,102,000 $ (113,354,000) $ 6,800,000