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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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