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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Basic and diluted shares outstanding            
Weighted average common shares - basic (in shares) 139,113,390   137,840,045   138,724,479 137,802,461
Weighted average DownREIT units outstanding (in shares) 7,500   7,500   7,500 7,500
Effect of dilutive securities (in shares) 497,341   367,465   495,397 374,334
Weighted average common shares - diluted (in shares) 139,618,231   138,215,010   139,227,376 138,184,295
Calculation of Earnings per Share - basic            
Net income attributable to common stockholders $ 168,281 $ 170,366 $ 254,662 $ 141,643 $ 338,647 $ 396,305
Net income allocated to unvested restricted shares (435)   (727)   (935) (1,167)
Net income attributable to common stockholders, adjusted $ 167,846   $ 253,935   $ 337,712 $ 395,138
Weighted average common shares - basic (in shares) 139,113,390   137,840,045   138,724,479 137,802,461
Earnings per common share - basic (in dollars per share) $ 1.21   $ 1.84   $ 2.43 $ 2.87
Calculation of Earnings per Share - diluted            
Net income attributable to common stockholders $ 168,281 $ 170,366 $ 254,662 $ 141,643 $ 338,647 $ 396,305
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships 12   11   23 22
Adjusted net income attributable to common stockholders $ 168,293   $ 254,673   $ 338,670 $ 396,327
Weighted average common shares - diluted (in shares) 139,618,231   138,215,010   139,227,376 138,184,295
Earnings per common share - diluted (in dollars per share) $ 1.21   $ 1.84   $ 2.43 $ 2.87