Quarterly report pursuant to Section 13 or 15(d)

Leasehold Acquisition And Related Issuance Of Common Stock (Details)

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Leasehold Acquisition And Related Issuance Of Common Stock (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 15, 2016
USD ($)
shares
Jul. 31, 2016
USD ($)
a
shares
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 09, 2016
a
MMcfe
Acquisition            
Purchase price       $ 58,195 $ 131,683  
Sale of common stock (in shares) | shares 26,750,000          
Proceeds from issuance of stock $ 753,000     $ 752,599    
Over-Allotment Option            
Acquisition            
Option period 30 days          
Options given to underwriters to purchase stock (in shares) | shares 4,012,500          
Marcellus Shale | Primary Seller            
Acquisition            
Area of land | a           55,000
Net production of leasehold acquired | MMcfe           14
Subsequent event | Over-Allotment Option            
Acquisition            
Sale of common stock (in shares) | shares   3,012,500        
Proceeds from issuance of stock   $ 85,000        
Subsequent event | Marcellus Shale | Scenario Forecast            
Acquisition            
Purchase price     $ 545,000      
Subsequent event | Marcellus Shale | Primary Seller | Scenario Forecast            
Acquisition            
Purchase price     450,000      
Subsequent event | Marcellus Shale | Third Party Seller            
Acquisition            
Area of land | a   11,500        
Option period   30 days        
Subsequent event | Marcellus Shale | Third Party Seller | Scenario Forecast            
Acquisition            
Purchase price     $ 95,000