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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Basic and diluted shares outstanding |  |  |  |
Weighted average common shares - basic | 131,330,078 | 129,208,839 | 130,165,873 | 126,057,793
Weighted average DownREIT units outstanding (in shares) | 7,500 | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | 568,417 | 0 | 554,627 | 411,821
Weighted average common shares - diluted | 131,905,995 | 129,216,339 | 130,728,000 | 126,477,114
Calculation of Earnings per Share - basic |  |  |  |
Net income attributable to common stockholders | $ 241,100 | $ (10,715) | $ 540,929 | $ 100,929
Net income allocated to unvested restricted shares | (366) | 16 | (858) | (166)
Net income attributable to common stockholders, adjusted | 240,734 | (10,699) | 540,071 | 100,763
Weighted average common shares - basic | 131,330,078 | 129,208,839 | 130,165,873 | 126,057,793
Earnings per common share - basic (in dollars per share) | $ 1.83 | $ (0.08) | $ 4.15 | $ 0.80
Calculation of Earnings per Share - diluted |  |  |  |
Net income attributable to common stockholders | 241,100 | (10,715) | 540,929 | 100,929
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations | 9 | 8 | 26 | 24
Adjusted net income available to common stockholders | $ 241,109 | $ (10,707) | $ 540,955 | $ 100,953
Weighted average common shares - diluted | 131,905,995 | 129,216,339 | 130,728,000 | 126,477,114
Earnings per common share - diluted (in dollars per share) | $ 1.83 | $ (0.08) | $ 4.14 | $ 0.80
Options to purchase shares of common stock excluded from computation of earnings per share amount (in shares) |  |  | 1,499 | 605,899
Estimated forfeiture rate of stock options (as a percent) |  |  | 1.40% |

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