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Commitments and Contingencies - Natural Gas Gathering Agreement (Details) (Gas Gathering Agreement, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Gas Gathering Agreement
 
Years ending December 31  
2014 $ 42,542
2015 42,334
2016 42,272
2017 41,991
2018 41,825
Thereafter 100,559
Total future obligation $ 311,523