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Other Investments (Summarizes Our Investment) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Fair value at beginning of period $ 20,990  
Sale of Midas Gold Shares, net of costs to sell (10,560)  
Fair value at end of period 8,060  
Midas Gold shares held at the end of the period 82,275,217 82,275,217
Midas Gold Shares [Member]
    
Fair value at beginning of period 20,990 69,489
Sale of Midas Gold Shares, net of costs to sell (10,560)  
Unrealized gain/(loss) based on the fair value at the end of the period (2,370) (48,499)
Fair value at end of period 8,060 20,990
Estimated tax benefit/(expense) for the period $ 821 $ 17,915
Midas Gold shares held at the end of the period 15,802,615 31,802,615