Summary Of Significant Accounting Policies (Rollforward Analysis Of The Allowance Against Accounts Receivable Balance) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| 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) |
| X | ||||||||||
- Definition Accounts Receivable Offset For Aquisitions Adjustment No definition available.
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- Definition Allowance For Bad Debts, Foreign Currency Gain No definition available.
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- Definition Reclassification To Leasehold Costs Related To Signing Bonus No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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