Accounts Receivable - Third Parties Accounts Receivable—Third Parties (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts Receivable, after Allowance for Credit Loss [Abstract]
Trade customers	$ 6,289	$ 9,730
Allowance for credit losses	(148)	(476)
Trade Customer Receivable Net Current	6,141	9,254
Other receivables	866	660
Accounts receivable, net—third parties	$ 7,007	$ 9,914