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Net Income per Common Share (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net Income per Common Share |  |  |  |
Weighted average shares used for the basic net income per share computation | 284,928,969 | 272,588,332 | 284,469,689 | 268,024,691
Incremental shares from share-based compensation | 126,265 | 194,133 | 137,625 | 228,142
Weighted average shares used for diluted net income per share computation | 285,372,256 | 273,099,487 | 284,924,336 | 268,569,855
Unvested Shares |  |  |  |
Net Income per Common Share |  |  |  |
Unvested shares from share-based compensation that were anti-dilutive | 237,861 | 44,191 | 164,111 | 32,016
Convertible Partnership Units |  |  |  |
Net Income per Common Share |  |  |  |
Weighted average partnership common units convertible to common shares that were dilutive | 317,022 | 317,022 | 317,022 | 317,022
Unvested shares from share-based compensation that were anti-dilutive | 359,980 | 88,182 | 207,948 | 88,182

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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