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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
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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Amount classified as assets attributable to disposal group held for sale or disposed of.

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