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Other Investments (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 132 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2012
Apr. 30, 2011
Dec. 31, 2010
Apr. 30, 2011
Midas Gold Corp [Member]
Dec. 31, 2012
Midas Gold Corp [Member]
Dec. 31, 2011
Midas Gold Corp [Member]
Apr. 30, 2011
Midas Gold Corp [Member]
Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]                    
Number of shares issued in transaction, (Shares)   30,402,615         30,402,615     30,402,615
Number of shares acquired (in shares)                   1,400,000
Aggregate purchase price   $ 3,632               $ 3,632
Common stock, shares held (in shares) 81,563,498 71,503,883 81,563,498         31,802,615 31,802,615  
Total Midas Common Stock Outstanding (in shares)               114,794,136    
Percentage of basic shares of subsidiary held               28.00%    
Fair value of shares received   78,872     78,872          
Deferred income tax benefit/(expense) 20,147 (35,522) (15,375)       29,675      
Valuation allowance 41,817 29,291 41,817   6,086 31,886        
Unrealized loss on Midas Gold Shares (50,363) 37,347 (13,016)              
Estimated Income Tax Expense (Benefit), for the Period 19,576 (44,192)                
Unrealized Gain (Loss) Based on Fair Value at the End of the Period (50,363) 37,347                
Fair Value at beginning of period 119,871     65            
Fair Value at end of period 69,489   69,489              
Other investments (Note 4) 69,489   69,489              
Midas Gold shares held at the end of the period 81,563,498 71,503,883 81,563,498         31,802,615 31,802,615  
Fair Value of Investment in Subsidiary   $ 119,851