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Organization, Basis of Presentation and Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) state community home $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) state community home $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares
Organization and Basis of Presentation |  |  |  |
Number of operating apartment communities | community | 257 |  | 257 |
Number of apartment homes included in operating apartment communities owned | home | 74,857 |  | 74,857 |
Number of states where operating apartment communities owned are located | state | 11 |  | 11 |
Number of communities with apartments under reconstruction | community | 7 |  | 7 |
Number of apartment homes under reconstruction | home | 2,787 |  | 2,787 |
Number of owned communities under construction | community | 26 |  | 26 |
Expected number of apartment homes under construction | home | 8,117 |  | 8,117 |
Communities under development rights | community | 34 |  | 34 |
Estimated number of apartment homes in communities to be developed | home | 10,080 |  | 10,080 |
Weighted Average Number of Shares Outstanding, Basic | shares | 131,977,578 | 129,856,335 | 131,930,916 | 129,574,118
Weighted Average Number of Limited Partnership and General Partnership Unit Outstanding, Basic and Diluted | shares | 7,500 | 7,500 | 7,500 | 7,500
Weighted Average Number Diluted Shares Outstanding Adjustment | shares | 1,101,361 | 384,486 | 1,192,947 | 356,614
Earnings Per Share, Basic | $ / shares | $ 1.30 | $ 1.22 | $ 2.88 | $ 2.31
Weighted Average Number of Shares Outstanding, Diluted | shares | 133,086,439 | 130,248,321 | 133,131,363 | 129,938,232
Net Income (Loss) Available to Common Stockholders, Basic | $ 172,324 | $ 158,086 | $ 380,469 | $ 299,825
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic | 445 | 254 | 975 | 487
Undistributed Earnings, Basic | 171,879 | 157,832 | 379,494 | 299,338
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | (9) | (9) | (19) | (17)
Net Income (Loss) Available to Common Stockholders, Diluted | $ 172,333 | $ 158,095 | $ 380,488 | $ 299,842
Earnings Per Share, Diluted | $ / shares | $ 1.29 | $ 1.21 | $ 2.86 | $ 2.31

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