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Discontinued Operations, Assets and Liabilities (Details) - Discontinued Operations, Held-for-sale or Disposed of by Sale - Zambian Operations - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Trade receivables, less allowance for doubtful accounts $ 6,949 $ 6,638
Inventories 11,643 11,829
Net property 288 342
Other assets 1,896 2,022
Total assets 20,776 20,831
Accounts payable 4,053 5,263
Accrued and other liabilities 1,059 991
Total liabilities 5,112 6,254
Net assets $ 15,664 $ 14,577