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Summary of Significant Accounting Policies (Analysis of Change in Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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)

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