Financial Instruments - Schedule of Impact that Derivatives not Qualifying as Hedging Instruments in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2020 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
Derivative Instruments And Hedging Activities Disclosure [Abstract] | |||||||||||
Net cash received (paid) on settled derivative instruments | $ 143,905 | $ (8,820) | $ (111,147) | ||||||||
Unrealized gain (loss) | (56,220) | (86,517) | 171,582 | ||||||||
Price risk management activities income (expense) | $ (66,968) | $ (19,882) | $ (68,682) | $ 243,217 | $ (59,508) | $ 43,760 | $ 29,990 | $ (109,579) | $ 87,685 | $ (95,337) | $ 60,435 |