Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 18, 2020	Dec. 31, 2021	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, expensed	$ 813	$ 29,357	$ 4,227	$ 72,842
Cash paid for interest, capitalized	1,261	22,885	4,585	36,671
Cash paid for interest, treated as a reduction of debt	0	46,417	0	85,303
Cash paid for income taxes	0	453	184	2,361
Cash received from income tax refunds	10,457	1,932	3	9,820
Noncash investing and financing activities
Increase in asset retirement obligations	23,398	4,328	112,760	13,560
Increase (decrease) in liabilities for capital expenditures	1,867	(12,809)	35,679	(17,740)
Conversion of convertible senior notes into common stock	$ 0	$ 11,501	$ 0	$ 0