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Accounts Receivable—Third Parties (Schedule Of Accounts Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, after Allowance for Credit Loss [Abstract]    
Trade customers $ 9,730 $ 17,325
Allowance for doubtful accounts (476) (921)
Nontrade Receivables, Current 660 0
Accounts receivable, net—third parties $ 9,914 $ 16,404