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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 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Oct. 31, 2013
Los Cardones, Mexico [Member]
Dec. 31, 2013
Los Cardones, Mexico [Member]
Dec. 31, 2012
Los Cardones, Mexico [Member]
Feb. 29, 2012
Los Cardones, Mexico [Member]
Jan. 31, 2014
Subsequent Event [Member]
Dec. 31, 2013
Subsequent Event [Member]
Jul. 31, 2014
Subsequent Event [Member]
Los Cardones, Mexico [Member]
Jan. 31, 2014
Subsequent Event [Member]
Los Cardones, Mexico [Member]
Business Acquisition [Line Items]                        
Percentage of interest sold 100.00%                      
Sale price of gold project           $ 13,000            
Proceeds from sale of gold project         7,000              
Proceeds to be received from sale of joint venture interest                 6,250 6,000    
Payment due date                 Jul. 31, 2014   Jul. 31, 2014  
Increase to sale price of gold project                       250
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%        
Adjusted percentage interest to be earned under agreement               62.50%        
Gain on disposal of mineral property, net   2,934 77,803 79,766                
Other long-term liabilities   635   635                
Write-down of mineral property   250   250                
Write-down of mineral property (Note 6)   $ (250)   $ (250)