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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
BASIC
Income from continuing operations attributable to common shareholders									$ 79,067	$ 89,109	$ 103,418
Income from discontinued operations attributable to common shareholders									0	0	1,682
Net income attributable to common shareholders									$ 79,067	$ 89,109	$ 105,100
Weighted-average common shares outstanding - basic (in shares)									237,758,408	233,633,058	233,455,056
Income from continuing operations, basic (usd per share)									$ 0.33	$ 0.38	$ 0.44
Income from discontinued operations, basic (usd per share)									0.00	0.00	0.01
Net income attributable to common shareholders, basic (usd per share)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.06	$ (0.12)	$ 0.23	$ 0.21	$ 0.33	$ 0.38	$ 0.45
DILUTED:
Impact of assumed conversions									$ 147	$ (159)	$ 0
Income from continuing operations attributable to common shareholders									79,214	88,950	103,418
Income from discontinued operations									0	0	1,682
Impact of assumed conversions:									0	0	0
Income from discontinued operations attributable to common shareholders									0	0	1,682
Net income attributable to common shareholders									$ 79,214	$ 88,950	$ 105,100
Weighted-average common shares outstanding - basic (in shares)									237,758,408	233,633,058	233,455,056
Effect of dilutive securities:
Share options (in shares)									86,285	230,352	296,719
Operating Partnership Units (in units)									3,693,144	3,815,621	0
Weighted-average common shares outstanding (in shares)									241,537,837	237,679,031	233,751,775
Income from continuing operations, diluted (usd per share)									$ 0.33	$ 0.37	$ 0.44
Income from discontinued operations, diluted (usd per share)									0.00	0.00	0.01
Net income attributable to common shareholders, diluted (usd per share)	$ 0.12	$ 0.02	$ 0.02	$ 0.17	$ 0.06	$ (0.12)	$ 0.23	$ 0.20	$ 0.33	$ 0.37	$ 0.45

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