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Divestitures (Narrative) (Details)
$ in Thousands
1 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Aug. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
rig
Segment Reporting Information [Line Items]        
Assets held for sale $ 0     $ 5,908
Oil and Natural Gas [Member]        
Segment Reporting Information [Line Items]        
Proceeds from non-core oil and natural gas asset sales, net of related expenses $ 0 $ 1,200 $ 2,200  
Drilling [Member]        
Segment Reporting Information [Line Items]        
Number of drilling rigs in assets held for sale | rig       7