CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
SHAREHOLDERS' EQUITY:
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	150,000,000	150,000,000
Common stock, issued (in shares)	95,095,860	94,936,282
Common stock, outstanding (in shares)	95,095,860	94,936,282