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Divestitures (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 01, 2022
Mar. 08, 2022
Sep. 17, 2021
Aug. 16, 2021
Mar. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]                  
Proceeds from non-core oil and natural gas asset sales, net of related expenses $ 45,400                
Gain (loss) on Disposition of Assets           $ 2,158 $ 4,031 $ 6,399 $ 6,213
Contract Drilling                  
Segment Reporting Information [Line Items]                  
Proceeds from non-core oil and natural gas asset sales, net of related expenses           3,900 600 6,600 5,000
Proceeds from Sale of Other Assets   $ 3,600   $ 16,100 $ 7,300        
Drilling                  
Segment Reporting Information [Line Items]                  
Proceeds from non-core oil and natural gas asset sales, net of related expenses           3,000 4,300 9,400 8,200
Gain (loss) on Disposition of Assets           $ 2,500 $ 3,100 $ 6,700 $ 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            
Disposition of propertyplant equipment transaction cost     $ 2,200