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Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Advances to suppliers $ 0 $ 27,635
Collateral posted with broker for derivative instruments 2,986 10,306
Prepaid insurance 0 13,536
Derivative assets 2,963 2,075
Other 3,729 5,604
Total $ 9,678 $ 59,156