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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) community home building $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) community Claim home plaintiff building $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares
Basic and diluted shares outstanding |  |  |  |
Weighted average common shares - basic (in shares) | shares | 137,715,192 | 136,997,756 | 137,457,293 | 136,901,164
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 584,354 | 499,798 | 541,399 | 533,642
Weighted average common shares - diluted (in shares) | shares | 138,307,046 | 137,505,054 | 138,006,192 | 137,442,306
Calculation of Earnings per Share - basic |  |  |  |
Net income attributable to common stockholders | $ | $ 238,248 | $ 356,392 | $ 639,348 | $ 791,767
Net income allocated to unvested restricted shares | $ | (672) | (872) | (1,794) | (2,036)
Net income attributable to common stockholders, adjusted | $ | $ 237,576 | $ 355,520 | $ 637,554 | $ 789,731
Weighted average common shares - basic (in shares) | shares | 137,715,192 | 136,997,756 | 137,457,293 | 136,901,164
Earnings per common share - basic (in dollars per share) | $ / shares | $ 1.73 | $ 2.60 | $ 4.64 | $ 5.77
Calculation of Earnings per Share - diluted |  |  |  |
Net income attributable to common stockholders | $ | $ 238,248 | $ 356,392 | $ 639,348 | $ 791,767
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships | $ | 11 | 10 | 32 | 30
Adjusted net income attributable to common stockholders | $ | $ 238,259 | $ 356,402 | $ 639,380 | $ 791,797
Weighted average common shares - diluted (in shares) | shares | 138,307,046 | 137,505,054 | 138,006,192 | 137,442,306
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 1.72 | $ 2.59 | $ 4.63 | $ 5.76
Loss Contingencies [Line Items] |  |  |  |
Number of operating apartment communities | community | 263 |  | 263 |
Number of apartment homes included in operating apartment communities owned | home | 76,076 |  | 76,076 |
Avalon at Edgewater |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of operating apartment communities | building | 2 |  | 2 |
Number of operating apartment communities, uninhabitable | building | 1 |  | 1 |
Number of units in operating apartment communities, uninhabitable | home | 240 |  | 240 |
Number of apartment homes included in operating apartment communities owned | home | 168 |  | 168 |
Loss contingency, new class action claims filed number |  |  | 3 |
Loss contingency class action claims filed, number of apartments included in settlement |  |  | 66 |
Loss Contingency Class Action Claims Filed, Number of Apartments Included in Settlement Submitted |  |  | 42 |
Loss Contingency Class Action Claims Filed, Number of Apartments Included in Settlement Submitted Amount | $ |  |  | $ 6,800 |
Loss contingency, total class action claims filed number |  |  | 4 |
Loss contingency, new claims filed, number |  |  | 19 |
Loss contingency, number of plaintiffs | plaintiff |  |  | 143 |
Loss contingency, claims filed, number, not consolidated |  |  | 1 |
Loss contingency, number of plaintiffs, remaining in class action settlement | plaintiff |  |  | 2 |
Loss contingency, claims filed, number, consolidated |  |  | 18 |
Loss contingency, new subrogation claims filed, number |  |  | 6 |
Loss contingency, subrogation claims filed dismissed, number |  |  | 1 |
Loss Contingency Subrogation Claims Filed Pending Not Dismissed Number |  |  | 1 |
Loss contingency, subrogation claims filed pending, number |  |  | 4 |

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