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Organization and Accounting Policies (Rollforward of Aggregate Allowance for Bad Debt) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Organization and Accounting Policies [Abstract] |  |  |  |
Balance at beginning of period | $ (1,904) | $ (1,876) | $ (1,508) | $ (2,535)
Bad debt charge | (151) | (54) | (1,140) | (30)
Adjustment associated with reversal of allowance on Mutamba |  |  | 593 |
Adjustment associated with settlement of customs audit |  |  |  | 623
Foreign currency gain |  | 53 |  | 65
Balance at end of period | $ (2,055) | $ (1,877) | $ (2,055) | $ (1,877)

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