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Fair Value Of Financial Instruments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Maximum [Member]
Sep. 30, 2013
Maximum [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Minimum [Member]
Sep. 30, 2013
Minimum [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]                      
Weighted average gold price per ounce (in dollars per ounce)               1,247   1,038  
Estimated gold production (in ounces)                 650,000   350,000
Timing of commencement of commercial production                 6 years   3 years
Cash Equivalents   $ 1,351 $ 15,834 $ 1,351 $ 15,834            
Marketable Securities   231 626 231 626            
Amayapampa interest   4,813 4,813     4,813 4,813        
Other investments (Midas Gold shares)   26,714 69,489 26,714 69,489            
Assets held for sale (mill equipment)   $ 6,500 $ 10,000     $ 6,500 $ 10,000        
Level Three Assets Percentage 29.00%                    
Fair Value Inputs, Discount Rate 15.00%