Discontinued Operations - Summarized Financial Information (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]
Income from discontinued operations, net of tax	$ 0	$ (2,484)	$ 0	$ (1,355)
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]
Net sales	0	0	0	5,261
Other income, net	0	2,484	0	2,196
Cost of products sold	0	0	0	4,819
Selling, general and administrative	0	0	0	937
Currency exchange losses, net	0	0	0	18
Income from discontinued operations before income taxes	0	2,484	0	1,683
Provision for income taxes	0	0	0	328
Income from discontinued operations, net of tax	$ 0	$ 2,484	$ 0	$ 1,355