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Organization and Accounting Policies (Rollforward of Aggregate Allowance for Bad Debt) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Organization and Accounting Policies [Abstract] |  |
Balance at beginning of period | $ (2,273) | $ (1,508)
Bad debt charge | (101) | (810)
Adjustment associated with reversal of allowance on Mutamba receivable |  | 593
Adjustment associated with Sasol acquisition | (2,879) |
Foreign currency gain (loss) | 161 |
Balance at end of period | $ (5,092) | $ (1,725)

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