Discontinued Operations - Related to Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income	$ (82)	$ (848)	$ (359)	$ (1,170)
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	(82)	(141)	(359)	(660)
Income from discontinued operations	0	(707)	0	(510)
Net income	$ (82)	$ (848)	$ (359)	$ (1,170)