Summary of Significant Accounting Policies (Analysis of Change in Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Summary of Significant Accounting Policies [Abstract] | |||
| Balance at beginning of period | $ (2,273) | $ (1,508) | $ (2,535) |
| Bad debt (charge) income, net of receipts | (875) | (1,165) | 341 |
| Adjustment associated with reversal of allowance on Mutamba receivable | 593 | 623 | |
| Adjustment associated with Sasol acquisition | (2,879) | ||
| Foreign currency gain (loss) | 286 | (193) | 63 |
| Balance at end of period | $ (5,741) | $ (2,273) | $ (1,508) |
| X | ||||||||||
- Definition Allowance For Bad Debts, Foreign Currency Gain No definition available.
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- Definition Allowance For Doubtful Accounts, Business Acquisition Adjustment No definition available.
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- Definition Allowance For Doubtful Accounts Receivable Recovery Adjustments No definition available.
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- References No definition available.
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| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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