Annual report pursuant to Section 13 and 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Gains/Losses on Derivatives (Details)

v3.20.4
DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Gains/Losses on Derivatives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Gain (Loss) on Settled Commodity Derivatives $ 188,264 $ 44,377 $ (22,886)
Gain (Loss) on Unsettled Commodity Derivatives 39,878 (173,214) 207,892
Gain (Loss) on Derivative Instruments, Net $ 228,141 $ (128,837) $ 185,006