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Mineral Properties (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2012
Sep. 30, 2011
Los Cardones, Mexico [Member]
Dec. 31, 2013
Los Cardones, Mexico [Member]
Dec. 31, 2012
Los Cardones, Mexico [Member]
Dec. 31, 2012
Awak Mas, Indonesia [Member]
Dec. 31, 2011
Awak Mas, Indonesia [Member]
Business Acquisition [Line Items]                        
Payment for interest in project under the earn in agreement                   $ 2,000    
Percentage interest to be earned by third party investor under agreement, before adjustment                   60.00% 60.60%  
Adjusted percentage interest to be earned under agreement                   62.50%    
Total percentage interest to be earned by third party investor under agreement, before adjustment                     80.80%  
Additional payment for interest in project under earn-in agreement                   20,000    
Voting rights in subsidiary held solely by reporting entity                   37.50%    
Voting rights in subsidiary that are held in trust                   62.50%    
Additional percentage interest to be earned under earn in right agreement                     20.20%  
Cash received under additional option agreement                     3,500  
Payments under option agreements to purchase land 2,000 50 50 50 50 50     2,000      
Gain on disposal of mineral property, net   2,934 77,803       79,766       2,934  
Payment made to third party for land               538        
Other long-term liabilities   635 635       635     635    
Restricted cash                     70 134
Write-down of mineral property   $ 250         $ 250     $ 250 $ 250