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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Employee benefits, payroll and related taxes $ 102,711 $ 82,028
Wodgina Project acquisition consideration obligation 137,092 260,686
Other 200,960 233,583
Total $ 440,763 $ 576,297