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Accounts Receivable (Schedule of Accounts Receivable, Noncurrent) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Noncurrent receivables $ 36,539 $ 41,234
Allowance for expected credit losses (274) 0
Noncurrent receivables, net $ 36,265 $ 41,234