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Discontinued Operations - Related to Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income	$ (160)	$ (836)	$ (519)	$ (2,006)
Discontinued Operations, Held-for-sale or Disposed of by Sale | South African Distribution Business and Zambian Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from continuing operations	(160)	(836)	(519)	(1,496)
Income from discontinued operations	0	0	0	(510)
Net income	$ (160)	$ (836)	$ (519)	$ (2,006)

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