Assets Held for Sale and Discontinued Operations, Assets and Liabilities (Details) (Zambian Operations, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Zambian Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 1,538	$ 2,980
Trade receivables, less allowance for doubtful accounts	8,162	7,452
Inventories	11,112	11,359
Net property	281	317
Other assets	778	1,326
Total assets	21,871	23,434
Accounts payable	3,965	5,447
Accrued and other liabilities	1,535	930
Total liabilities	5,500	6,377
Net assets	$ 16,371	$ 17,057