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Mineral Properties (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 129 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Feb. 07, 2012
Concordia, Mexico [Member]
Sep. 30, 2012
Concordia, Mexico [Member]
Jun. 30, 2012
Concordia, Mexico [Member]
Jun. 30, 2011
Awak Mas, Indonesia [Member]
Sep. 30, 2012
Awak Mas, Indonesia [Member]
Sep. 30, 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%     60.00%      
Adjusted percentage interest to be earned under agreement               62.50%        
Total percentage interest to be earned by third party investor under agreement, before adjustment                 80.00%      
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                 20.00%      
Cash received under additional option agreement                     3,500  
Gain on disposal of mineral property, net 1,000 (5) 1,934 77,802 81,598         1,000 1,934  
Restricted cash                   $ 59 $ 59 $ 134