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Derivatives (Tables)
6 Months Ended
Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Instruments, Gain (Loss)
The following table summarizes derivative activity for the three and six-month periods ended June 30, 2021, and 2020 (in thousands):

Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(Gain) loss on commodity derivative contracts$— $(2,241)$— $(12,467)
Cash received on settlements$— $6,490 $— $10,577