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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
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Basic and diluted shares outstanding |  |
Weighted average common shares - basic | 129,288,771 | 119,680,510
Weighted average DownREIT units outstanding (in shares) | 7,500 | 7,500
Effect of dilutive securities (in shares) | 333,286 | 423,118
Weighted average common shares - diluted | 129,629,557 | 120,111,128
Calculation of Earnings per Share - basic |  |
Net income attributable to common stockholders | $ 141,739 | $ 75,427
Net income allocated to unvested restricted shares | (232) | (139)
Net income attributable to common stockholders, adjusted | 141,507 | 75,288
Weighted average common shares - basic | 129,288,771 | 119,680,510
Earnings per common share - basic (in dollars per share) | $ 1.09 | $ 0.63
Calculation of Earnings per Share - diluted |  |
Net income attributable to common stockholders | 141,739 | 75,427
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations | 9 | 8
Adjusted net income available to common stockholders | $ 141,748 | $ 75,435
Weighted average common shares - diluted | 129,629,557 | 120,111,128
Earnings per common share - diluted (in dollars per share) | $ 1.09 | $ 0.63
Options to purchase shares of common stock excluded from computation of earnings per share amount (in shares) | 605,899 | 608,148
Estimated forfeiture rate of stock options (as a percent) | 1.00% |

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