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Divestitures (Narrative) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
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 $ 900 $ 2,100  
Drilling [Member]      
Segment Reporting Information [Line Items]      
Number of drilling rigs in assets held for sale | rig     7