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Other Investments (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 141 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Dec. 31, 2012
Apr. 30, 2011
Midas Gold Corp [Member]
Sep. 30, 2013
Midas Gold Corp [Member]
Sep. 30, 2013
Midas Gold Corp [Member]
Apr. 06, 2011
Midas Gold Corp [Member]
Sale of Stock, Number of Shares Issued in Transaction             30,402,615      
Capital stock, shares outstanding (in shares) 81,788,835 81,788,835 81,788,835 81,788,835 81,788,835 81,563,498       31,802,615
Fair value of shares received               $ 26,714 $ 26,714  
Deferred Income Tax Expense (Benefit) 1 9,925 (15,373) (6,276) 2     1,670 15,701  
Percentage Of Shares Owned of Fair Value Investee               24.90% 24.90%  
Unrealized gain/ (loss) on long-term investments 4,547 29,132 (42,775) (13,184) (55,791)     4,547 42,775  
Number of Shares Acquired             1,400,000      
Purchase Price of Private Placement             $ 3,632      
Sale of Stock, Percentage of Ownership after Transaction 24.90%