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Discontinued Operations - Net Loss (Income) Related to Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (income) loss	$ (929)	$ (1,926)	$ 2,863
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) loss from continuing operations	(929)	(1,416)	2,971
Income from discontinued operations	0	(510)	(108)
Net (income) loss	$ (929)	$ (1,926)	$ 2,863

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Amount after tax of income (loss) from continuing operations attributable to the noncontrolling interest.

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