Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
BASIC
Income from continuing operations attributable to common shareholders	$ 48,107	$ 30,142
Income from discontinued operations attributable to common shareholders	0	1,687
Net income attributable to common shareholders	$ 48,107	$ 31,829
Weighted-average number of common shares outstanding	232,642,803	232,525,675
Income (loss) from continuing operations (in USD per share)	$ 0.21	$ 0.13
Income (loss) from discontinued operations (in USD per share)	0.00	0.01
Net income (loss) attributable to common shareholders (USD per share)	$ 0.21	$ 0.14
DILUTED
Income from continuing operations attributable to common shareholders	$ 48,107	$ 30,142
Impact of assumed conversions	1,058	0
Income from continuing operations attributable to common shareholders	49,165	30,142
Income from discontinued operations attributable to common shareholders	0	1,687
Impact of assumed conversions	0	0
Income from discontinued operations attributable to common shareholders	0	1,687
Net income attributable to common shareholders	$ 49,165	$ 31,829
Effect of dilutive securities:
Share options (in shares)	132,191	431,590
6.00% Convertible Guaranteed Notes (in shares)	1,941,237	0
Nonvested common shares (in shares)	348,748	0
OP Units (in shares)	3,820,192	0
Weighted-average common shares outstanding (in shares)	238,885,171	232,957,265
Income from continuing operations (USD per share)	$ 0.21	$ 0.13
Income (loss) from discontinued operations (USD per share)	0.00	0.01
Net income (loss) attributable to common shareholders (USD per share)	$ 0.21	$ 0.14
6% Convertible Guaranteed Note [Member]
Effect of dilutive securities:
Stated interest rate	6.00%		6.00%