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Organization and Accounting Policies (Rollforward of the Allowance for Bad Debt) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Organization and Accounting Policies [Abstract] |  |  |  |
Balance at beginning of period | $ (1,725) | $ (1,854) | $ (1,508) | $ (2,535)
Bad debt recovery (charge) | (179) | (5) | (989) | 24
Adjustment associated with reversal of allowance on Mutamba |  |  | 593 |
Adjustment associated with settlement of customs audit |  |  |  | 623
Foreign currency gain (loss) |  | (17) |  | 12
Balance at end of period | $ (1,904) | $ (1,876) | $ (1,904) | $ (1,876)

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