Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
BASIC
Income (loss) from continuing operations attributable to common shareholders - basic	$ 21,448	$ 2,691	$ 38,076	$ (17,682)
Income from discontinued operations attributable to common shareholders - basic	17,272	287	12,548	12,516
Net income (loss) attributable to common shareholders	38,720	2,978	50,624	(5,166)
Weighted-average common shares outstanding - basic	229,463,522	213,649,374	228,337,871	204,923,085
Income (loss) from continuing operations	$ 0.09	$ 0.01	$ 0.17	$ (0.09)
Income from discontinued operations	$ 0.08	$ 0.00	$ 0.05	$ 0.06
Net income (loss) attributable to common shareholders	$ 0.17	$ 0.01	$ 0.22	$ (0.03)
DILUTED
Income (loss) from continuing operations attributable to common shareholders - basic	21,448	2,691	38,076	(17,682)
Impact of assumed conversions:
Share options	0	0	0	0
Income (loss) from continuing operations attributable to common shareholders	21,448	2,691	38,076	(17,682)
Income from discontinued operations attributable to common shareholders - basic	17,272	287	12,548	12,516
Share options	0	0	0	0
Income from discontinued operations attributable to common shareholders	17,272	287	12,548	12,516
Net income (loss) attributable to common shareholders	$ 38,720	$ 2,978	$ 50,624	$ (5,166)
Effect of dilutive securities:
Share options	458,588	756,691	492,149	0
Weighted-average common shares outstanding	229,922,110	214,406,065	228,830,020	204,923,085
Income (loss) per common share:
Income (loss) from continuing operations	$ 0.09	$ 0.01	$ 0.17	$ (0.09)
Income from discontinued operations	$ 0.08	$ 0.00	$ 0.05	$ 0.06
Net income (loss) attributable to common shareholders	$ 0.17	$ 0.01	$ 0.22	$ (0.03)