Organization and Accounting Policies (Rollforward of Aggregate Allowance for Bad Debt) (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
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| Organization and Accounting Policies [Abstract] | ||||
| Balance at beginning of period | $ (5,092) | $ (1,725) | $ (2,273) | $ (1,508) |
| Bad debt charge | (395) | (179) | (496) | (989) |
| Adjustment associated with reversal of allowance on Mutamba receivable | 593 | |||
| Adjustment associated with Sasol acquisition | (2,879) | |||
| Foreign currency gain (loss) | (88) | 73 | ||
| Balance at end of period | $ (5,575) | $ (1,904) | $ (5,575) | $ (1,904) |
| X | ||||||||||
- Definition Allowance For Bad Debts, Foreign Currency Gain No definition available.
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| X | ||||||||||
- Definition Allowance For Doubtful Accounts, Business Acquisition Adjustment No definition available.
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| X | ||||||||||
- Definition Allowance For Doubtful Accounts Receivable Recovery Adjustments No definition available.
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| X | ||||||||||
- 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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| X | ||||||||||
- 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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