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Business and Significant Accounting Policies - Assets and Liabilities of Discontinued Operations (Details)
$ in Thousands
Dec. 31, 2014
USD ($)
Accounting Policies [Abstract]  
Cash and cash equivalents $ 382
Other current assets 12
Current assets 394
Mineral properties, net 14,641
Other assets 982
Noncurrent assets 15,623
Total assets 16,017
Accounts payable 201
Deferred revenue 7,000
Total liabilities $ 7,201