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Business and Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]  
Assets and Liabilities of Discontinued Operations
(in thousands)  December 31,
   2014
Cash and cash equivalents  $382 
Other current assets   12 
 Current assets   394 
 Mineral properties, net   14,641 
 Other assets   982 
  Total assets  $16,017 
Accounts payable  $201 
Deferred revenue   7,000 
  Total liabilities  $7,201 
Proceeds from Sale of Discontinued Operations
(in thousands)  Three and nine months ended September 30,
   2015
Proceeds from sale of MH-LLC  $24,000 
Net assets and liabilities disposed of   9,998 
Non-controlling interest   256 
Expenses of sale of MH-LLC   439 
Gain on sale of discontinued operations, before tax   13,307 
Income tax expense   561 
Gain on sale of discontinued operations  $12,746