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Schedule of Intangible Assets and Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Balance at beginning of period $ 26,451 $ 15,851
Sales contracts acquired in the acquisition of Uranerz 0 10,600
Balance, end of period 26,451 26,451
Accumulated amortization, beginning of period 17,334 11,970
Amortization of sales contracts 218 5,364
Accumulated amortization, end of period 17,552 17,334
Net book value $ 8,899 $ 9,117