Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Balance Sheets (Parenthetical)
Common Stock, No Par Value
Common stock, shares authorized	unlimited	unlimited
Common Stock, Shares, Issued	152,910,737	152,476,564
Common Stock, Shares, Outstanding	152,910,737	152,476,564