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Accounts Receivable (Schedule of Accounts Receivable) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Receivables [Abstract]    
Trade and other accounts receivable $ 191,035 $ 201,427
Bank promissory notes 23,169 18,563
Allowance for expected credit losses (3,878) (1,719)
Accounts receivable, net $ 210,326 $ 218,271