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INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | The following is a summary of changes in intangible assets related to favorable sales contracts acquired in business combinations for the years ended December 31, 2016 and December 31, 2015:
| December 31, |  | December 31,
Sales Contracts | 2016 |  | 2015
Cost |  |  |
Balance at beginning of period | $ | 18,657 |  |  | $ | 15,851 |
Sales contracts acquired in the acquisition of Uranerz (Note 5) | — |  |  | 10,600 |
Sales contracts fulfilled | (3,623 | ) |  | (7,794 | )
Balance, end of period | 15,034 |  |  | 18,657 |
Accumulated amortization, beginning of period | 9,540 |  |  | 11,970 |
Amortization of sales contracts | 3,318 |  |  | 5,364 |
Sales contracts fulfilled | (3,623 | ) |  | (7,794 | )
Accumulated amortization, end of period | 9,235 |  |  | 9,540 |
Net book value | $ | 5,799 |  |  | $ | 9,117 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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