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Discontinued Operations - Net Loss (Income) Related to Noncontrolling Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net income | $ (965) | $ (929) | $ (1,926)
South African Distribution Business and Zambian Operations | Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income from continuing operations | (965) | (929) | (1,416)
Income from discontinued operations | 0 | 0 | (510)
Net income | $ (965) | $ (929) | $ (1,926)

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