CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY [Abstract]
Common shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common shares, authorized (in shares)	70,000,000	70,000,000
Common shares, issued (in shares)	27,658,059	26,973,531
Common shares, outstanding (in shares)	27,658,059	26,973,531
Excess shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Excess shares, authorized (in shares)	30,000,000	30,000,000
Excess shares, issued (in shares)	0	0