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Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 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 1,489 10,306
Prepaid insurance 14,932 13,536
Derivative assets 1,346 2,075
Other 6,881 5,604
Total $ 24,648 $ 59,156