Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 1,166,409	$ 687,549	$ 3,234,021	$ 2,038,905
Gain (Loss) on derivative instruments	115,191	(59,164)	(308,654)	(499,794)
Gain on sale of assets and other income	21,825	2,315	32,076	21,217
Total revenues and other income	1,303,425	630,700	2,957,443	1,560,328
Revenue from production
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,120,909	687,549	3,101,736	2,038,905
Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	909,146	556,620	2,581,766	1,704,226
Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	39,299	31,903	115,986	77,074
Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	172,464	99,026	403,984	257,605
Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	45,500	0	132,285	0
United States | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	247,562	167,010	684,099	464,767
United States | Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	18,288	16,356	53,035	33,480
United States | Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	21,009	11,127	51,412	24,442
United States Offshore | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	597,242	340,001	1,675,389	1,079,418
United States Offshore | Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	16,079	11,046	48,151	31,866
United States Offshore | Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	52,143	17,444	121,911	56,855
United States Offshore | Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	181	0
Canada     | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	29,445	29,110	106,559	89,708
Canada     | Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,932	4,501	14,800	11,728
Canada     | Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	99,312	70,455	230,661	176,308
Canada     | Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	45,500	0	132,104	0
Canada Offshore | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	30,030	20,499	97,216	70,333
Other | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 4,867	$ 0	$ 18,503	$ 0