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Divestitures (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Sep. 17, 2021
Mar. 30, 2021
Sep. 30, 2020
Aug. 31, 2020
Sep. 30, 2021
Aug. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]                
Gain (loss) on Disposition of Assets     $ 222 $ 1,356 $ 4,031 $ 89 $ 6,213  
Oil and Natural Gas [Member]                
Segment Reporting Information [Line Items]                
Proceeds from Sale of Other Assets   $ 7,100         19,500  
Proceeds from non-core oil and natural gas asset sales, net of related expenses             5,000 $ 1,200
Drilling [Member]                
Segment Reporting Information [Line Items]                
Proceeds from non-core oil and natural gas asset sales, net of related expenses     600 2,000 4,300 4,800 8,200  
Gain (loss) on Disposition of Assets     $ 200 $ 1,300 $ 3,100 $ 1,400 $ 5,200  
Corporate and Other                
Segment Reporting Information [Line Items]                
Sale of corporate headquarters building and land $ 35,000              
Gain on sale of corporate headquarters building and land 900              
Transaction cost $ 2,200