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Other Investments (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 132 Months Ended 1 Months Ended 1 Months Ended
Feb. 28, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Apr. 30, 2011
Apr. 30, 2011
Midas Gold Corp [Member]
Dec. 31, 2013
Midas Gold Corp [Member]
Dec. 31, 2012
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      
Number of shares acquired (in shares)                     1,400,000
Aggregate purchase price                     $ 3,632
Common stock, shares held (in shares)   82,275,217 81,563,498     81,563,498     31,802,615 31,802,615  
Stock Issued During Period, Value, New Issues   477 23,464 30,988 161,148            
Total Midas Common Stock Outstanding (in shares) 15,802,615                    
Percentage of basic shares of subsidiary held 12.40%                    
Fair value of shares received       78,872     78,872        
Deferred income tax benefit/(expense)   15,373 20,147 (35,522)   (2)   29,675      
Valuation allowance   43,955 41,817 29,291   41,817 6,086        
Unrealized loss on Midas Gold Shares   (48,499) (50,363) 37,347   (61,515)          
Estimated Income Tax Expense (Benefit), for the Period   17,915 19,576                
Midas Gold shares held at the end of the period   82,275,217 81,563,498     81,563,498     31,802,615 31,802,615  
Fair value at beginning of period   69,489 119,851                
Unrealized Gain (Loss) Based on Fair Value at the End of the Period   (48,499) (50,363)                
Fair value at end of period   $ 20,990 $ 69,489 $ 119,851   $ 69,489