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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
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Jun. 30, 2018 USD ($) community home building $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) community Claim home plaintiff building $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares
Basic and diluted shares outstanding |  |  |  |
Weighted average common shares - basic (in shares) | shares | 137,840,045 | 137,580,677 | 137,802,461 | 137,326,204
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 367,465 | 584,974 | 374,334 | 519,921
Weighted average common shares - diluted (in shares) | shares | 138,215,010 | 138,173,151 | 138,184,295 | 137,853,625
Calculation of Earnings per Share - basic |  |  |  |
Net income attributable to common stockholders | $ | $ 254,662 | $ 165,225 | $ 396,305 | $ 401,100
Net income allocated to unvested restricted shares | $ | (727) | (468) | (1,167) | (1,122)
Net income attributable to common stockholders, adjusted | $ | $ 253,935 | $ 164,757 | $ 395,138 | $ 399,978
Weighted average common shares - basic (in shares) | shares | 137,840,045 | 137,580,677 | 137,802,461 | 137,326,204
Earnings per common share - basic (in dollars per share) | $ / shares | $ 1.84 | $ 1.20 | $ 2.87 | $ 2.91
Calculation of Earnings per Share - diluted |  |  |  |
Net income attributable to common stockholders | $ | $ 254,662 | $ 165,225 | $ 396,305 | $ 401,100
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships | $ | 11 | 10 | 22 | 21
Adjusted net income attributable to common stockholders | $ | $ 254,673 | $ 165,235 | $ 396,327 | $ 401,121
Weighted average common shares - diluted (in shares) | shares | 138,215,010 | 138,173,151 | 138,184,295 | 137,853,625
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 1.84 | $ 1.20 | $ 2.87 | $ 2.91
Loss Contingencies [Line Items] |  |  |  |
Number of operating apartment communities | community | 268 |  | 268 |
Number of apartment homes included in operating apartment communities owned | home | 77,995 |  | 77,995 |
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 |  |  | 44 |
Loss Contingency Class Action Claims Filed, Number of Apartments Included in Settlement Submitted Amount | $ |  |  | $ 6,900 |
Loss Contingency Class Action Claims Filed, Number of Apartments Issued Awards By Claims Adjuster |  |  | 25 |
Loss Contingency Class Action Claims Filed, Timing Remaining for Claim Evaluation |  |  | 2 months |
Loss contingency, total class action claims filed number |  |  | 4 |
Loss contingency, claims filed, number, consolidated |  |  | 18 |
Loss contingency, new claims filed, number |  |  | 19 |
Loss contingency, number of plaintiffs | plaintiff |  |  | 143 |
Loss Contingency Class Action Claims Filed, Number of Apartments in Settlement Resolved |  |  | 50 |
Loss Contingency Class Action Claims Filed, Number of Apartments in Settlement Previously Resolved |  |  | 10 |
Loss Contingency Subrogation Claims Filed Pending Not Dismissed Number |  |  | 1 |
Loss Contingency Class Action Claims Filed, Number of Apartments Included in Settlement Remaining |  |  | 1 |
Loss contingency, new subrogation claims filed, number |  |  | 7 |
Loss contingency, subrogation claims filed dismissed, number |  |  | 1 |
Loss Contingency Subrogation Claims Filed Resolved Number |  |  | 2 |
Loss contingency, subrogation claims filed pending, number |  |  | 4 |

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