Supplemental Oil and Gas Information (Unaudited) - Results of Operations for Oil and Gas Producing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Revenues	$ 3,448,900	$ 4,220,200	$ 2,801,200
Other operating revenues	7,900	26,700	17,500
Total revenues	3,456,800	4,246,900	2,818,700
Costs and expenses
Lease operating expenses	784,400	679,300	539,500
Severance and ad valorem taxes	42,800	57,000	41,200
Transportation, gathering and processing	232,985	212,711	187,028
Costs of purchased natural gas	51,682	171,991	0
Exploration costs charged to expense	223,900	119,800	50,100
Undeveloped lease amortization	10,900	13,300	18,900
Depreciation, depletion and amortization	850,500	763,900	782,100
Accretion of asset retirement obligations	46,000	46,200	46,600
Impairment of assets			189,300
Selling and general expenses	37,700	44,500	43,600
Other expenses (benefits)	56,900	141,800	31,000
Total costs and expenses	2,337,800	2,250,500	1,929,300
Results of operations before taxes	1,119,000	1,996,400	889,400
Income tax expense (benefit)	237,800	417,300	172,700
Results of operations	881,200	1,579,100	716,700
Crude Oil and Natural Gas Liquids
Revenues
Revenues	3,005,800	3,500,600	2,433,500
Natural Gas
Revenues
Revenues	370,900	537,900	367,700
Sales of purchased natural gas
Revenues
Revenues	72,200	181,700
U.S.
Revenues
Revenues	2,921,800	3,435,800	2,321,500
Other operating revenues	6,500	25,400	16,000
Total revenues	2,928,300	3,461,200	2,337,500
Costs and expenses
Lease operating expenses	630,700	522,700	406,400
Severance and ad valorem taxes	41,400	55,700	39,600
Transportation, gathering and processing	157,000	142,200	126,500
Costs of purchased natural gas	0	200
Exploration costs charged to expense	166,500	38,800	30,400
Undeveloped lease amortization	8,100	8,700	11,100
Depreciation, depletion and amortization	706,000	617,000	616,500
Accretion of asset retirement obligations	37,800	36,500	36,900
Impairment of assets			0
Selling and general expenses	11,800	20,400	20,500
Other expenses (benefits)	31,200	126,300	99,400
Total costs and expenses	1,790,500	1,568,500	1,387,300
Results of operations before taxes	1,137,800	1,892,700	950,200
Income tax expense (benefit)	232,700	370,800	183,900
Results of operations	905,100	1,521,900	766,300
U.S. | Crude Oil and Natural Gas Liquids
Revenues
Revenues	2,829,100	3,210,300	2,199,700
U.S. | Natural Gas
Revenues
Revenues	92,700	225,300	121,800
U.S. | Sales of purchased natural gas
Revenues
Revenues	0	200
Canada | Conventional gas
Revenues
Revenues	516,100	761,600	474,800
Other operating revenues	1,400	1,300	1,500
Total revenues	517,500	762,900	476,300
Costs and expenses
Lease operating expenses	151,800	155,100	136,300
Severance and ad valorem taxes	1,400	1,300	1,600
Transportation, gathering and processing	76,000	70,500	60,500
Costs of purchased natural gas	51,700	171,800
Exploration costs charged to expense	400	800	400
Undeveloped lease amortization	100	200	200
Depreciation, depletion and amortization	142,200	141,500	163,800
Accretion of asset retirement obligations	7,800	9,600	9,700
Impairment of assets			171,300
Selling and general expenses	16,500	21,900	16,500
Other expenses (benefits)	16,800	12,400	(66,200)
Total costs and expenses	464,700	585,100	494,100
Results of operations before taxes	52,800	177,800	(17,800)
Income tax expense (benefit)	11,200	43,600	(1,700)
Results of operations	41,600	134,200	(16,100)
Canada | Crude Oil and Natural Gas Liquids | Conventional gas
Revenues
Revenues	165,700	267,500	228,900
Canada | Natural Gas | Conventional gas
Revenues
Revenues	278,200	312,600	245,900
Canada | Sales of purchased natural gas | Conventional gas
Revenues
Revenues	72,200	181,500
Other
Revenues
Revenues	11,000	22,800	4,900
Other operating revenues	0	0	0
Total revenues	11,000	22,800	4,900
Costs and expenses
Lease operating expenses	1,900	1,500
Lease operating expenses			(3,200)
Severance and ad valorem taxes	0	0	0
Transportation, gathering and processing	0	0	0
Costs of purchased natural gas	0	0
Exploration costs charged to expense	57,000	80,200	19,300
Undeveloped lease amortization	2,700	4,400	7,600
Depreciation, depletion and amortization	2,300	5,400	1,800
Accretion of asset retirement obligations	400	100	0
Impairment of assets			18,000
Selling and general expenses	9,400	2,200	6,600
Other expenses (benefits)	8,900	3,100	(2,200)
Total costs and expenses	82,600	96,900	47,900
Results of operations before taxes	(71,600)	(74,100)	(43,000)
Income tax expense (benefit)	(6,100)	2,900	(9,500)
Results of operations	(65,500)	(77,000)	(33,500)
Other | Crude Oil and Natural Gas Liquids
Revenues
Revenues	11,000	22,800	4,900
Other | Natural Gas
Revenues
Revenues	0	0	$ 0
Other | Sales of purchased natural gas
Revenues
Revenues	$ 0	$ 0