Quarterly report pursuant to Section 13 or 15(d)

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical)

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UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS        
Losses accrued on firm purchase commitments $ 0 $ 5,000 $ 0 $ 5,000