Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common Stock, No Par Value
Common stock, shares authorized	unlimited	unlimited
Common Stock, Shares, Issued	152,920,815	152,929,907
Common Stock, Shares, Outstanding	152,920,815	152,929,907