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Other Investments (Summary) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2015
Feb. 28, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sale of Midas Gold Shares, net of costs to sell       $ (2,772) $ (10,560)
Gain/(loss) during the period     $ 3,196 (1,593) (4,112)
Midas Gold Shares [Member]          
Fair value at beginning of period     1,798 6,163  
Sale of Midas Gold Shares, net of costs to sell $ (2,772) $ (10,560)   (2,772)  
Gain/(loss) during the period     3,196 (1,593)  
Fair value at end of period     $ 4,994 $ 1,798 $ 6,163
Midas Gold Shares held at end of the period 7,802,615 15,802,615 7,802,615 7,802,615