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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) home shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) home shares
Supplemental disclosures of non-cash investing and financing activities |  |  |
Common stock issued through the dividend reinvestment plan (in shares) | shares | 2,272 | 3,058 | 2,396
Common stock issued through the dividend reinvestment plan | $ 387,000 | $ 558,000 | $ 424,000
Number of shares withheld to satisfy employees' tax withholding and other liabilities | shares | 68,565 | 60,319 | 53,453
Shares withheld to satisfy employees' tax withholding and other liabilities, value | $ 10,556,000 | $ 10,542,000 | $ 8,356,000
Number of shares forfeited | shares | 4,860 |  |
Shares cancelled upon forfeiture | $ 717,000 | 588,000 | 694,000
Common stock dividends declared but not paid | 204,191,000 | 196,094,000 | 185,397,000
Change in redemption value of redeemable noncontrolling interest | (223,000) | (2,026,000) | (1,489,000)
Increase (decrease) in derivative liabilities | (6,366,000) | 1,171,000 |
Cash flow hedge losses reclassified to earnings | (6,143,000) | (7,070,000) | (6,433,000)
Investments in unconsolidated real estate entities | 217,432,000 | 163,475,000 |
Increase (decrease) in derivative assets |  | 12,114,000 | $ 12,085,000
Net operating real estate | $ 15,822,878,000 | $ 16,342,893,000 |
Restricted Stock and Restricted Stock Converted From Performance Shares |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Granted (in shares) | shares | 187,010 | 201,824 | 197,018
Restricted Stock Converted From Performance Shares [Member] |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Granted (in shares) | shares | 88,297 | 128,482 | 115,618
Restricted stock |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Granted (in shares) | shares | 98,713 | 73,342 | 81,400
Fair value of shares issued | $ 15,950,000 | $ 13,171,000 | $ 13,217,000
Number of shares forfeited | shares | 4,860 | 3,388 | 4,262
Accumulated earnings less dividends |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Change in redemption value of redeemable noncontrolling interest | $ (223,000) | $ (2,026,000) | $ (1,489,000)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  | 65,000 |
Deferred Compensation, Share-based Payments [Member] | Non-employee directors |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Fair value of shares issued |  |  | $ 3,894,000
Avalon Maplewood |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Net operating real estate |  | $ 16,361,000 |
Non-employee directors | Deferred Compensation, Share-based Payments [Member] |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Granted (in shares) | shares |  |  | 44,327
Secured notes | Notes Payable Maturities 2020 | Avalon Hoboken [Member] |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Assumed principal amount of indebtedness |  |  | $ 67,904,000
Secured notes | Notes Payable Maturities 2020 | Avalon Columbia Pike [Member] |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Assumed principal amount of indebtedness |  |  | $ 70,507,000
NYC JV |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Repayments of secured debt | $ 395,939,000 |  |
Apartment homes | home | 1,301 |  |
West Hollywood Affordable [Member] |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Apartment homes | home |  |  | 77
Accounts receivable, net |  |  | $ 18,643,000
NYC JV |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Investments in unconsolidated real estate entities | $ 74,159,000 |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |

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