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Business and Organization (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
MMcf / d
mi
Jun. 30, 2016
USD ($)
Business and Organization    
Payment to acquire equity interest | $   $ 45,044
Stonewall Gas Gathering LLC    
Business and Organization    
Ownership percentage 15.00% 15.00%
Distance of regional gathering pipeline extension (in miles) | mi 67  
Regional gathering pipeline commitment | MMcf / d 900