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General and Administration (Schedule of General And Administrative Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
General and Administration [abstract]    
General and administration $ 20,834 $ 22,315
Workers' participation 1,808 1,477
General and administrative subtotal 22,642 23,792
Share-based payments 12,444 6,013
Total general and administrative expense $ 35,086 $ 29,805