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Other Investments (Summary) (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Sale of Midas Gold Shares, net of costs to sell     $ (2,772)  
Midas Gold Shares [Member]        
Fair value at beginning of period   $ 1,798 $ 6,163 $ 6,163
Sale of Midas Gold Shares, net of costs to sell $ (2,772)     (2,772)
Gain/(loss) during the period   3,586   (1,593)
Fair value at end of period   $ 5,384   $ 1,798
Midas Gold Shares held at end of the period   7,802,615   7,802,615