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Fair Value Of Financial Instruments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Maximum [Member]
Mar. 31, 2013
Maximum [Member]
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Minimum [Member]
Mar. 31, 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 $ 3,991 $ 15,834 $ 3,991 $ 15,834            
Marketable Securities 461 626 461 626            
Amayapampa interest 4,813 4,813     4,813 4,813        
Other investments (Midas Gold shares) 40,707 69,489 40,707 69,489            
Assets held for sale (mill equipment $ 10,000 $ 10,000     $ 10,000 $ 10,000