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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, 2016 USD ($) community Claim home building $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) community Claim home plaintiff building $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares
Loss Contingencies [Line Items] |  |  |  |
Number of Real Estate Properties | community | 260 |  | 260 |
Number of apartment homes included in operating apartment communities owned | home | 75,504 |  | 75,504 |
Basic and diluted shares outstanding |  |  |  |
Weighted average common shares - basic | shares | 136,918,770 | 131,977,578 | 136,852,323 | 131,930,916
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 511,463 | 1,101,361 | 550,564 | 1,192,947
Weighted average common shares - diluted | shares | 137,437,733 | 133,086,439 | 137,410,387 | 133,131,363
Calculation of Earnings per Share - basic |  |  |  |
Net income attributable to common stockholders | $ | $ 197,444 | $ 172,324 | $ 435,377 | $ 380,469
Net income allocated to unvested restricted shares | $ | (516) | (445) | (1,147) | (975)
Net income attributable to common stockholders, adjusted | $ | $ 196,928 | $ 171,879 | $ 434,230 | $ 379,494
Weighted average common shares - basic | shares | 136,918,770 | 131,977,578 | 136,852,323 | 131,930,916
Earnings per common share - basic (in dollars per share) | $ / shares | $ 1.44 | $ 1.30 | $ 3.17 | $ 2.88
Calculation of Earnings per Share - diluted |  |  |  |
Net income attributable to common stockholders | $ | $ 197,444 | $ 172,324 | $ 435,377 | $ 380,469
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations | $ | 10 | 9 | 20 | 19
Adjusted net income available to common stockholders | $ | $ 197,454 | $ 172,333 | $ 435,397 | $ 380,488
Weighted average common shares - diluted | shares | 137,437,733 | 133,086,439 | 137,410,387 | 133,131,363
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 1.44 | $ 1.29 | $ 3.17 | $ 2.86
Estimated forfeiture rate of stock options (as a percent) |  |  | 0.80% |
Avalon at Edgewater [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
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 apartment homes included in operating apartment communities owned | home | 168 |  | 168 |
Loss Contingency New Class Action Claims Filed Number | Claim |  |  | 3 |
Loss Contingency, New Claims Filed, Number | Claim |  |  | 20 |
Loss Contingency, Number of Plaintiffs | plaintiff |  |  | 141 |
Loss Contingency, Pending Claims, Number | Claim | 19 |  | 19 |

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