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Discontinued Operations - Discontinued Operations Assets and Liabilities (Details) - South African Distribution Business and Zambian Operations - Discontinued Operations, Held-for-sale or Disposed of by Sale - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total assets | $ 0 | $ 0
Accrued and other liabilities | 0 | 686
Total liabilities | 0 | 686
Net (liabilities) assets | $ 0 | $ (686)

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