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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

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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