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Organization And Accounting Policies (Rollforward Analysis Of The Allowance Against Accounts Receivable Balance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Charged to costs and expenses | $ 49 | $ (63) | $ (232) | $ (577)
Gabon [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Balance at beginning of year |  |  | (5,211) | (4,221)
Charged to costs and expenses | 100 | (100) | (232) | (577)
Reclassification related to Sojitz acquisition |  |  | (694) |
Foreign currency loss |  |  | (583) | (84)
Balance at end of period | $ (6,720) | $ (4,882) | $ (6,720) | $ (4,882)

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