Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
BASIC
Income (loss) from continuing operations attributable to common shareholders - basic	$ 2,069	$ 163,481	$ (19,769)	$ 163,552
Income from discontinued operations attributable to common shareholders - basic	909	5,469	14,603	22
Net income (loss) attributable to common shareholders	2,978	168,950	(5,166)	163,574
Weighted-average number of common shares outstanding	213,649,374	154,980,137	204,923,085	154,564,041
Income (loss) from continuing operations	$ 0.01	$ 1.05	$ (0.10)	$ 1.06
Income from discontinued operations	$ 0.00	$ 0.04	$ 0.07	$ 0.00
Net income (loss) attributable to common shareholders	$ 0.01	$ 1.09	$ (0.03)	$ 1.06
DILUTED
Income (loss) from continuing operations attributable to common shareholders - basic	2,069	163,481	(19,769)	163,552
Impact of assumed conversions:
Share options	0	0	0	0
Operating Partnership Units	0	538	0	1,266
6.00% Convertible Guaranteed Notes	0	2,327	0	6,980
Series C Preferred Shares	0	1,573	0	4,489
Income (loss) from continuing operations attributable to common shareholders	2,069	167,919	(19,769)	176,287
Income from discontinued operations attributable to common shareholders - basic	909	5,469	14,603	22
Operating Partnership Units	0	(63)	0	(353)
Income (loss) from discontinued operations attributable to common shareholders	909	5,406	14,603	(331)
Net income (loss) attributable to common shareholders	$ 2,978	$ 173,325	$ (5,166)	$ 175,956
Effect of dilutive securities:
Share options	756,691	344,721	0	279,699
Operating Partnership Units	0	4,400,389	0	4,479,451
6.00% Convertible Guaranteed Notes	0	16,419,347	0	16,412,836
Series C Preferred Shares	0	4,710,570	0	4,713,043
Weighted-average common shares outstanding	214,406,065	180,855,164	204,923,085	180,449,070
Income (loss) per common share:
Income (loss) from continuing operations	$ 0.01	$ 0.93	$ (0.10)	$ 0.98
Income (loss) from discontinued operations	$ 0.00	$ 0.03	$ 0.07	$ 0.00
Net income (loss) attributable to common shareholders	$ 0.01	$ 0.96	$ (0.03)	$ 0.98