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Summary Of Significant Accounting Policies (Rollforward Analysis Of The Allowance Against Accounts Receivable Balance) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Bad debt recovery (charge) | $ 77 | $ (452) | $ (1,222)
Gabon |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at beginning of year | (7,033) | (5,211) | (4,221)
Bad debt recovery (charge) | 77 | (452) | (1,222)
Reclassification to leasehold costs related to signing bonus | 4,197 |  |
Reclassification related to Sojitz acquisition |  | (694) |
Foreign currency gain (loss) | 224 | (676) | 232
Balance at end of period | $ (2,535) | $ (7,033) | $ (5,211)

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