CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
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)	216,391,768	178,616,664
Common Shares, Outstanding (in shares)	216,391,768	178,616,664
Series C | Cumulative Convertible
Equity:
Preferred shares, liquidation preference	$ 96,770	$ 96,770
Preferred shares, shares issued (in shares)	1,935,400	1,935,400
Preferred shares, shares outstanding (in shares)	1,935,400	1,935,400
Series D | Cumulative Redeemable
Equity:
Preferred shares, liquidation preference	$ 0	$ 155,000
Preferred shares, shares issued (in shares)	0	6,200,000
Preferred shares, shares outstanding (in shares)	0	6,200,000