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Net Income per Common Share - Reconciliation of denominator in net income per share computation (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Weighted average shares used for the basic net income per share computation (in shares) | 319,945,932 | 290,664,368 | 311,556,279 | 286,599,191
Incremental shares from share-based compensation (in shares) | 317,085 | 225,796 | 309,131 | 189,072
Weighted average partnership common units convertible to common shares that were dilutive (in shares) | 0 | 317,022 | 0 | 317,022
Weighted average shares used for diluted net income per share computation (in shares) | 320,263,017 | 291,207,186 | 311,865,410 | 287,105,285
Unvested shares from share-based compensation |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation (in shares) | 7,892 | 261 | 6,529 | 1,378
Convertible common partnership units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation (in shares) | 463,119 | 397,690 | 434,981 | 271,890

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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://fasb.org/us-gaap/role/ref/legacyRef -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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