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Organization and Accounting Policies (Rollforward Analysis of the Allowance Against Accounts Receivable Balance) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Organization and Accounting Policies [Abstract] |  |
Balance at beginning of year | $ (1,508) | $ (2,535)
Bad debt recovery (charge) | (810) | 29
Adjustment associated with reversal of allowance on Mutamba receivable | 593 |
Adjustment associated with settlement of customs audit |  | 623
Foreign currency gain |  | 29
Balance at end of period | $ (1,725) | $ (1,854)

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