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v3.10.0.1

Organization, Basis of Presentation, and Significant Accounting Policies (Details 3) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | 15 Months Ended
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Dec. 31, 2018 USD ($) community home building $ / shares | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Jun. 30, 2017 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | Dec. 31, 2018 USD ($) community home building $ / shares shares | Dec. 31, 2017 USD ($) land_parcel $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2016 USD ($)
Basic and diluted shares outstanding |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares—basic | shares |  |  |  |  |  |  |  |  | 137,844,755 | 137,523,771 | 136,928,251 |
Weighted average DownREIT units outstanding (in shares) | shares |  |  |  |  |  |  |  |  | 7,500 | 7,500 | 7,500 |
Effect of dilutive securities (in shares) | shares |  |  |  |  |  |  |  |  | 436,986 | 535,415 | 525,886 |
Weighted average common shares - diluted (in shares) | shares |  |  |  |  |  |  |  |  | 138,289,241 | 138,066,686 | 137,461,637 |
Calculation of Earnings per Share—basic |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common stockholders | $ 385,734 | $ 192,486 | $ 254,662 | $ 141,643 | $ 237,573 | $ 238,248 | $ 165,225 | $ 235,875 | $ 974,525 | $ 876,921 | $ 1,034,002 |
Net income allocated to unvested restricted shares |  |  |  |  |  |  |  |  | (2,839) | (2,463) | (2,610) |
Net income attributable to common stockholders, adjusted |  |  |  |  |  |  |  |  | $ 971,686 | $ 874,458 | $ 1,031,392 |
Weighted average common shares—basic | shares |  |  |  |  |  |  |  |  | 137,844,755 | 137,523,771 | 136,928,251 |
Earnings per common share - basic (in dollars per share) | $ / shares | $ 2.79 | $ 1.39 | $ 1.84 | $ 1.03 | $ 1.72 | $ 1.73 | $ 1.20 | $ 1.72 | $ 7.05 | $ 6.36 | $ 7.53 |
Calculation of Earnings per Share—diluted |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common stockholders | $ 385,734 | $ 192,486 | $ 254,662 | $ 141,643 | $ 237,573 | $ 238,248 | $ 165,225 | $ 235,875 | $ 974,525 | $ 876,921 | $ 1,034,002 |
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations |  |  |  |  |  |  |  |  | 44 | 42 | 41 |
Adjusted net income attributable to common stockholders |  |  |  |  |  |  |  |  | $ 974,569 | $ 876,963 | $ 1,034,043 |
Weighted average common shares—diluted | shares |  |  |  |  |  |  |  |  | 138,289,241 | 138,066,686 | 137,461,637 |
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 2.79 | $ 1.39 | $ 1.84 | $ 1.03 | $ 1.72 | $ 1.72 | $ 1.20 | $ 1.72 | $ 7.05 | $ 6.35 | $ 7.52 |
Dividends per common share: (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 5.88 | $ 5.68 | $ 5.4 |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |
Abandoned pursuits costs |  |  |  |  |  |  |  |  | $ 4,388 | $ 2,370 | $ 4,183 |
Casualty and impairment loss (gain), net |  |  |  |  |  |  |  |  | 215 | $ 6,250 | (3,935) |
Number of Land Parcels Impaired | land_parcel |  |  |  |  |  |  |  |  |  | 3 |  |
Impairment of investment in unconsolidated entities |  |  |  |  |  |  |  |  | 0 | $ 0 | 0 |
Business interruption insurance proceeds |  |  |  |  |  |  |  |  | $ 26 | 3,498 | 20,564 |
Number of Real Estate Properties | community | 270 |  |  |  |  |  |  |  | 270 |  |  |
Number of Units in Real Estate Property | home | 78,549 |  |  |  |  |  |  |  | 78,549 |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  |  |  |  |  |  |  | $ 826 | 9,350 | 10,500 |
Avalon at Edgewater |  |  |  |  |  |  |  |  |  |  |  |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  |  |  |  |  |  |  |  |  | (8,702) |
Business interruption insurance proceeds |  |  |  |  |  |  |  |  |  |  | 20,306 |
Insurance proceeds |  |  |  |  |  |  |  |  |  |  | 29,008 | $ 73,150
Number of Real Estate Properties | building | 2 |  |  |  |  |  |  |  | 2 |  |  |
Number Of Real Estate Properties, Uninhabitable | building | 1 |  |  |  |  |  |  |  | 1 |  |  |
Number Of Units In Real Estate Property, Uninhabitable | home | 240 |  |  |  |  |  |  |  | 240 |  |  |
Number of Units in Real Estate Property | home | 168 |  |  |  |  |  |  |  | 168 |  |  |
New England |  |  |  |  |  |  |  |  |  |  |  |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  |  |  |  |  |  |  |  |  | (5,732) |
Insurance recoveries |  |  |  |  |  |  |  |  |  |  | 8,493 |
Casualty Loss |  |  |  |  |  |  |  |  |  |  | $ 2,761 |
Avalon Maplewood |  |  |  |  |  |  |  |  |  |  |  |
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  |  |  |  |  |  |  |  | 2,338 |  |
Business interruption insurance proceeds |  |  |  |  |  |  |  |  |  | 3,495 |  |
Insurance recoveries |  |  |  |  |  |  |  |  |  | $ 19,696 |  |

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