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Discontinued Operations - Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
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 sales $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 5,261 $ 0 $ 5,261  
(Loss) income from discontinued operations, net of tax                 0 (245) $ 1,325
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]                      
Net sales                 0 5,261 43,043
Cost of products sold                 0 4,819 34,764
Selling, general and administrative                 0 937 6,680
Restructuring and other charges                 0 0 14
Currency exchange losses (gains), net                 0 18 266
Other income, net                 0 596 580
Income from discontinued operations before income taxes                 0 83 1,899
Provision for income taxes                 0 328 574
(Loss) income from discontinued operations, net of tax                 $ 0 $ (245) $ 1,325