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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charged to costs and expenses | $ (452) | $ (1,222) | $ (2,699)
Gabon [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at beginning of year | (5,211) | (4,221) | (2,400)
Charged to costs and expenses | (452) | (1,222) | (2,699)
Reclassification related to Sojitz acquisition | (694) |  |
Foreign currency gain (loss) | (676) | 232 | 878
Balance at end of period | $ (7,033) | $ (5,211) | $ (4,221)

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