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Other Investments (Summary) (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2015
Feb. 28, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Sale of Midas Gold Shares, net of costs to sell     $ (2,772) $ (10,560)  
Midas Gold Shares [Member]          
Fair value at beginning of period     6,163 $ 20,990 $ 20,990
Sale of Midas Gold Shares, net of costs to sell $ (2,772) $ (10,560) (2,772)   (10,560)
Realized and unrealized loss during the period     (1,674)   (4,267)
Fair value at end of period     1,717   6,163
Estimated tax benefit/(expense) for the period     $ 414   $ 1,478
Midas Gold Shares held at end of the period 7,802,615 15,802,615 7,802,615   15,802,615