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Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income from discontinued operations, net of tax $ 470 $ 453 $ 778 $ 1,067
Discontinued Operations, Held-for-sale or Disposed of by Sale | Zambian Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net sales 11,384 10,589 22,541 20,649
Other income, net 107 15 173 28
Cost of products sold 9,058 8,455 18,048 16,151
Selling, general and administrative 1,682 1,605 3,284 3,159
Currency exchange losses (gains), net 38 (62) 208 (69)
Income from discontinued operations before income taxes 713 606 1,174 1,436
Provision for income taxes 243 153 396 369
Income from discontinued operations, net of tax $ 470 $ 453 $ 778 $ 1,067