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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) community home building $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) community Claim home plaintiff building $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares
Basic and diluted shares outstanding |  |  |  |
Weighted average common shares - basic (in shares) | shares | 137,580,677 | 136,918,770 | 137,326,204 | 136,852,323
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 584,974 | 511,463 | 519,921 | 550,564
Weighted average common shares - diluted (in shares) | shares | 138,173,151 | 137,437,733 | 137,853,625 | 137,410,387
Calculation of Earnings per Share - basic |  |  |  |
Net income attributable to common stockholders | $ | $ 165,225 | $ 197,444 | $ 401,100 | $ 435,377
Net income allocated to unvested restricted shares | $ | (468) | (516) | (1,122) | (1,147)
Net income attributable to common stockholders, adjusted | $ | $ 164,757 | $ 196,928 | $ 399,978 | $ 434,230
Weighted average common shares - basic (in shares) | shares | 137,580,677 | 136,918,770 | 137,326,204 | 136,852,323
Earnings per common share - basic (in dollars per share) | $ / shares | $ 1.20 | $ 1.44 | $ 2.91 | $ 3.17
Calculation of Earnings per Share - diluted |  |  |  |
Net income attributable to common stockholders | $ | $ 165,225 | $ 197,444 | $ 401,100 | $ 435,377
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships | $ | 10 | 10 | 21 | 20
Adjusted net income attributable to common stockholders | $ | $ 165,235 | $ 197,454 | $ 401,121 | $ 435,397
Weighted average common shares - diluted (in shares) | shares | 138,173,151 | 137,437,733 | 137,853,625 | 137,410,387
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 1.20 | $ 1.44 | $ 2.91 | $ 3.17
Loss Contingencies [Line Items] |  |  |  |
Number of operating apartment communities | community | 264 |  | 264 |
Number of apartment homes included in operating apartment communities owned | home | 76,158 |  | 76,158 |
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, total class action claims filed number |  |  | 4 |
Loss contingency, new claims filed, number |  |  | 20 |
Loss contingency, number of plaintiffs | plaintiff |  |  | 150 |
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 |  |  | 19 |
Loss contingency, new subrogation claims filed, number |  |  | 5 |
Loss contingency, subrogation claims filed dismissed, number |  |  | 1 |
Loss contingency, subrogation claims filed pending, number |  |  | 4 |

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