CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS [Abstract]
Common shares, par value	$ 0.001	$ 0.001
Common shares, shares authorized	800,000	800,000
Common shares, shares issued	317,042	315,034
Treasury shares, at cost	29,414	29,414