CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Gold and silver bullion, market value (in dollars)	$ 1,983	$ 2,062
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	500,000	500,000
Common, shares issued	215,337	212,646
Common, shares outstanding	215,337	212,646
Exchangeable, shares issued	81,749	83,379
Exchangeable, shares outstanding	81,749	83,379