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Organization And Accounting Policies (Rollforward Analysis Of The Allowance Against Accounts Receivable Balance) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at beginning of year | $ (2,535) | $ (7,033)
Bad debt recovery | 29 | 56
Adjustment associated with settlement of customs audit | 623 |
Foreign currency gain (loss) | 29 | (187)
Balance at end of period | (1,854) | (7,164)
Gabon |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Bad debt recovery | $ 32 | $ 100

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