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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Employee benefits, payroll and related taxes $ 82,028 $ 77,814
Wodgina Project acquisition consideration obligation 260,686 0
Other 210,446 179,509
Total $ 553,160 $ 257,323