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Business and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Assets and Liabilities 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 
 Noncurrent assets 15,623 
  Total assets $16,017 
Accounts payable $     201 
Deferred revenue 7,000 
  Total liabilities $ 7,201 
Gain on Sale Discontinued Operations
(in thousands) Year ended December 31,
  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 998 
Gain on sale of discontinued operations $12,309