Supplemental Oil and Gas Disclosures - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) MMBoe	Dec. 31, 2019 USD ($) MMBoe	Dec. 31, 2018 USD ($) MMBoe
Reserve Quantities [Line Items]
Oil and gas asset retirement obligations | $	$ 442,269	$ 369,478	$ 382,817
Percentage of proved oil, natural gas and NGL reserves attributable to all of oil and natural gas properties	100.00%	100.00%	100.00%
Proved reserves decrease	21.3	10.0	51.1
Decrease of production	20.0	19.0	16.7
Revision to previous estimates	24.2	9.7
Estimated proved reserves from extensions and discoveries		15.7	5.6
Purchases of estimated proved reserves			62.8
Prescribed rate of discounted future net cash flows	10.00%
ILX and Castex Acquisition
Reserve Quantities [Line Items]
Estimated proved reserves from extensions and discoveries	60.7
LLOG Acquisition
Reserve Quantities [Line Items]
Purchases of estimated proved reserves	4.7
Gunflint Acquisition
Reserve Quantities [Line Items]
Purchases of estimated proved reserves		3.0
Stone Energy Corporation
Reserve Quantities [Line Items]
Purchases of estimated proved reserves			59.3
Whistler Energy II, LLC
Reserve Quantities [Line Items]
Purchases of estimated proved reserves			3.5