Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 18, 2020	Sep. 30, 2021	Sep. 18, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 23,439	$ 333,284	$ 162,939	$ 884,744	$ 521,693
Oil sales
Disaggregation of Revenue [Line Items]
Revenues	22,311	305,093	152,136	818,714	489,251
Natural gas sales
Disaggregation of Revenue [Line Items]
Revenues	10	3,361	954	7,893	2,850
CO2 sales and transportation fees
Disaggregation of Revenue [Line Items]
Revenues	967	12,237	6,517	31,599	21,049
Oil marketing revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 151	$ 12,593	$ 3,332	$ 26,538	$ 8,543