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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Gold and silver bullion, market value (in dollars) $ 2,062 $ 24,483
Common stock, shares authorized 500,000,000 500,000,000
Common, shares issued 212,646,000 136,572,000
Common, shares outstanding 212,646,000 136,572,000
Exchangeable (2012)
    
Exchangeable, shares issued 83,379,000   
Exchangeable, shares outstanding 83,379,000   
Exchangeable (2007)
    
Exchangeable, shares issued    3,181,000
Exchangeable, shares outstanding    3,181,000