CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Shareholders' equity:
Common shares, par value (in dollars per share)	$ 0.0075	$ 0.0075
Common shares, shares authorized (in shares)	92,666,666	92,666,666
Common shares, shares outstanding (in shares)	33,412,263	28,491,318
Series B [Member]
Shareholders' equity:
Preference shares, par value (in dollars per share)	$ 0.05	$ 0.05
Preference shares, shares authorized (in shares)	1,000,000	1,000,000
Preference shares, shares designated (in shares)	8,000	8,000
Preference shares, shares issued (in shares)	0	2,959
Preference shares, shares outstanding (in shares)	0	2,959