Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 1,196,238	$ 758,829	$ 2,067,612	$ 1,351,356
Loss on crude contracts	(103,068)	(226,245)	(423,845)	(440,630)
Gain on sale of assets and other income	7,887	17,059	10,251	18,902
Total revenues and other income	1,101,057	549,643	1,654,018	929,628
Revenue from production
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,146,299	758,829	1,980,827	1,351,356
Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	969,774	656,810	1,672,620	1,147,606
Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	41,156	23,602	76,687	45,171
Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	135,369	78,417	231,520	158,579
Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	49,939	0	86,785	0
United States | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	264,841	183,267	436,537	297,757
United States | Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	18,062	9,596	34,747	17,124
United States | Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	19,034	6,872	30,403	13,315
United States Offshore | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	612,526	411,076	1,078,147	739,417
United States Offshore | Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	18,093	10,766	32,072	20,820
United States Offshore | Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	43,567	17,273	69,768	39,411
United States Offshore | Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	181	0	181	0
Canada     | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	40,417	30,695	77,114	60,598
Canada     | Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	5,001	3,240	9,868	7,227
Canada     | Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	72,768	54,272	131,349	105,853
Canada     | Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	49,758	0	86,604	0
Canada Offshore | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	38,354	31,772	67,186	49,834
Other | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 13,636	$ 0	$ 13,636	$ 0