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Other Investments (Tables)
12 Months Ended
Dec. 31, 2017
Investments, All Other Investments [Abstract]  
Summary of investment in Midas Gold Shares

 

 

 

 

 

 

 

 

 

    

December 31, 2017

    

December 31, 2016

 

Fair value at beginning of period

 

$

4,994

 

$

1,798

 

Gain/(loss) during the period

 

 

(1,248)

 

 

3,196

 

Fair value at end of period

 

$

3,746

 

$

4,994

 

 

 

 

 

 

 

 

 

Midas Gold Shares held at the end of the period

 

 

7,802,615

 

 

7,802,615