XML 72 R56.htm IDEA: XBRL DOCUMENT v3.10.0.1
Subsequent Events (Details)
a in Thousands, $ in Thousands
9 Months Ended
Nov. 02, 2018
USD ($)
a
well
Nov. 01, 2018
USD ($)
well
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Feb. 28, 2017
well
Subsequent Events          
Acquisition price     $ 0 $ 48,236  
Number of wells in which a working interest was acquired | well         4
Oil and Gas Properties | Disposal Group, Not Discontinued Operations          
Subsequent Events          
Proceeds from sale of properties       $ 16,000  
Subsequent Event | Oil and Gas Properties | Disposal Group, Not Discontinued Operations | Permian Basin          
Subsequent Events          
Number of units sold | shares   13,125,000      
Ownership interest sold   25.00%      
Proceeds from sale of properties   $ 14,500      
Number of wells sold | well   1,066      
Subsequent Event | Mississippian Lime and NW STACK areas of Oklahoma and Kansas          
Subsequent Events          
Acquisition price $ 25,100        
Number of wells in which a working interest was acquired | well 1,962        
Percentage of acquired wells operated by company 80.00%        
Subsequent Event | Mississippian Lime and NW STACK areas of Oklahoma and Kansas | Mid-continent          
Subsequent Events          
Working interest acquired 13.20%        
Gross number of acres acquired | a 410        
Net number of acres acquired | a 54        
Subsequent Event | Mississippian Lime and NW STACK areas of Oklahoma and Kansas | Mississippian Lime          
Subsequent Events          
Working interest acquired 13.20%