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INTANGIBLE ASSETS (Tables)
 12 Months Ended
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