CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Equity:
Preferred shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred shares, authorized shares (in shares)	100,000,000	100,000,000
Common shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common shares, authorized shares (in shares)	400,000,000	400,000,000
Common shares, shares issued (in shares)	157,522,107	146,552,589
Series B | Cumulative Redeemable
Equity:
Preferred shares liquidation preference	$ 79,000	$ 79,000
Preferred shares, convertible preferred, shares issued (in shares)	3,160,000	3,160,000
Preferred shares, redeemable preferred, shares outstanding (in shares)	3,160,000	3,160,000
Series C | Cumulative Convertible
Equity:
Preferred shares liquidation preference	103,995	104,760
Preferred shares, convertible preferred, shares issued (in shares)	2,079,904	2,095,200
Preferred shares, redeemable preferred, shares outstanding (in shares)	2,079,904	2,095,200
Series D | Cumulative Redeemable
Equity:
Preferred shares liquidation preference	$ 155,000	$ 155,000
Preferred shares, convertible preferred, shares issued (in shares)	6,200,000	6,200,000
Preferred shares, redeemable preferred, shares outstanding (in shares)	6,200,000	6,200,000