Supplemental Oil and Gas Information (Unaudited) - Results of Operations for Oil and Gas Producing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Revenues	$ 4,220,200	$ 2,801,200	$ 1,751,700
Other operating revenues	26,700	17,500	7,700
Total revenues	4,246,900	2,818,700	1,759,400
Costs and expenses
Lease operating expenses	679,300	539,500	600,100
Severance and ad valorem taxes	57,000	41,200	28,500
Transportation, gathering and processing	212,711	187,028	172,399
Costs of purchased natural gas	171,991	0	0
Restructuring expenses	0	0	49,994
Restructuring expenses			1,200
Exploration costs charged to expense	119,800	50,100	59,700
Undeveloped lease amortization	13,300	18,900	26,800
Depreciation, depletion and amortization	763,900	782,100	964,900
Accretion of asset retirement obligations	46,200	46,600	42,200
Impairment of assets		189,300
Impairment of assets			1,192,200
Selling and general expenses	44,500	43,600	48,800
Other expenses (benefits)	141,800	31,000	21,000
Total costs and expenses	2,250,500	1,929,300	3,157,800
Results of operations before taxes	1,996,400	889,400	(1,398,400)
Income tax expense (benefit)	417,300	172,700	(263,500)
Results of operations	1,579,100	716,700	(1,134,900)
Crude Oil and Natural Gas Liquids
Revenues
Revenues	3,500,600	2,433,500	1,511,600
Natural Gas
Revenues
Revenues	537,900	367,700	240,100
Sales of purchased natural gas
Revenues
Revenues	181,700
U.S.
Revenues
Revenues	3,435,800	2,321,500	1,405,300
Other operating revenues	25,400	16,000	6,500
Total revenues	3,461,200	2,337,500	1,411,800
Costs and expenses
Lease operating expenses	522,700	406,400	476,900
Severance and ad valorem taxes	55,700	39,600	27,200
Transportation, gathering and processing	142,200	126,500	127,700
Costs of purchased natural gas	200
Restructuring expenses			1,200
Exploration costs charged to expense	38,800	30,400	35,500
Undeveloped lease amortization	8,700	11,100	17,200
Depreciation, depletion and amortization	617,000	616,500	749,400
Accretion of asset retirement obligations	36,500	36,900	36,600
Impairment of assets		0
Impairment of assets			1,152,500
Selling and general expenses	20,400	20,500	24,600
Other expenses (benefits)	126,300	99,400	21,500
Total costs and expenses	1,568,500	1,387,300	2,670,300
Results of operations before taxes	1,892,700	950,200	(1,258,500)
Income tax expense (benefit)	370,800	183,900	(244,200)
Results of operations	1,521,900	766,300	(1,014,300)
U.S. | Crude Oil and Natural Gas Liquids
Revenues
Revenues	3,210,300	2,199,700	1,335,800
U.S. | Natural Gas
Revenues
Revenues	225,300	121,800	69,400
U.S. | Sales of purchased natural gas
Revenues
Revenues	200
Canada | Conventional gas
Revenues
Revenues	761,600	474,800	344,600
Other operating revenues	1,300	1,500	1,200
Total revenues	762,900	476,300	345,800
Costs and expenses
Lease operating expenses	155,100	136,300	121,600
Severance and ad valorem taxes	1,300	1,600	1,300
Transportation, gathering and processing	70,500	60,500	44,700
Costs of purchased natural gas	171,800
Restructuring expenses			0
Exploration costs charged to expense	800	400	600
Undeveloped lease amortization	200	200	400
Depreciation, depletion and amortization	141,500	163,800	213,200
Accretion of asset retirement obligations	9,600	9,700	5,600
Impairment of assets		171,300
Impairment of assets			0
Selling and general expenses	21,900	16,500	17,100
Other expenses (benefits)	12,400	(66,200)	(2,300)
Total costs and expenses	585,100	494,100	402,200
Results of operations before taxes	177,800	(17,800)	(56,400)
Income tax expense (benefit)	43,600	(1,700)	(21,400)
Results of operations	134,200	(16,100)	(35,000)
Canada | Crude Oil and Natural Gas Liquids | Conventional gas
Revenues
Revenues	267,500	228,900	174,000
Canada | Natural Gas | Conventional gas
Revenues
Revenues	312,600	245,900	170,600
Canada | Sales of purchased natural gas | Conventional gas
Revenues
Revenues	181,500
Other
Revenues
Revenues	22,800	4,900	1,800
Other operating revenues	0	0	0
Total revenues	22,800	4,900	1,800
Costs and expenses
Lease operating expenses	1,500	(3,200)	1,600
Severance and ad valorem taxes	0	0	0
Transportation, gathering and processing	0	0	0
Costs of purchased natural gas	0
Restructuring expenses			0
Exploration costs charged to expense	80,200	19,300	23,600
Undeveloped lease amortization	4,400	7,600	9,200
Depreciation, depletion and amortization	5,400	1,800	2,300
Accretion of asset retirement obligations	100	0	0
Impairment of assets		18,000
Impairment of assets			39,700
Selling and general expenses	2,200	6,600	7,100
Other expenses (benefits)	3,100	(2,200)	1,800
Total costs and expenses	96,900	47,900	85,300
Results of operations before taxes	(74,100)	(43,000)	(83,500)
Income tax expense (benefit)	2,900	(9,500)	2,100
Results of operations	(77,000)	(33,500)	(85,600)
Other | Crude Oil and Natural Gas Liquids
Revenues
Revenues	22,800	4,900	1,800
Other | Natural Gas
Revenues
Revenues	0	$ 0	$ 0
Other | Sales of purchased natural gas
Revenues
Revenues	$ 0