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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
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


The sales contracts acquired in the acquisition of Uranerz were recorded at their acquisition date fair value, which are the incremental cash flows available to the Company arising from above-market pricing of the contracts. The contracts have no residual value and a weighted average expected economic life of 0.94 years. Estimated amortization expense is as follows: (2017 - $3.30 million , 2018 – $2.43 million 2019 - $0.08 million, 2020 – nil).