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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Jan. 31, 2016 | Dec. 31, 2015
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Common stock issued through the dividend reinvestment plan (in shares) |  |  | 1,689 | 1,608 |  |
Common stock issued through the dividend reinvestment plan |  |  | $ 304 | $ 275 |  |
Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares) |  |  | 53,214 | 39,800 |  |
Shares withheld to satisfy employees' tax withholding and other liabilities, value |  |  | $ 8,316 | $ 5,921 |  |
Stock Issued During Period, Shares, Share-based Compensation, Forfeited (in shares) |  |  | 407 | 4,293 |  |
Stock Issued During Period, Value, Share-based Compensation, Forfeited |  |  | $ 627 | $ 502 |  |
Dividends declared but not paid | $ 185,384 | $ 171,098 | 185,384 | 171,098 |  | $ 171,257
Change in redemption value of redeemable noncontrolling interest |  |  | (529) |  |  |
Increase (Decrease) in Prepaid Expense and Other Assets |  |  | (2,689) |  |  |
Income (loss) on cash flow hedges | 719 | (31) | (73,826) | (67) |  |
Increase in accrued expenses, other liabilities and accrued interest payable |  |  | 53,591 |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  | (56,280) |  |  |
Cash flow hedge losses reclassified to earnings | 1,748 | 1,373 | 4,682 | 4,401 |  |
Impairment of Real Estate | 0 | $ 658 | (3,935) | (10,668) |  |
New England [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Impairment of Real Estate |  |  |  | 4,195 |  |
Avalon at Edgewater [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Impairment of Real Estate |  |  | (8,702) | (15,663) |  |
Avalon at Edgewater [Member] | New England [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Impairment of Real Estate |  |  |  | $ 26,039 |  |
Mortgage notes payable | Notes Payable Maturities 2020 [Member] | Avalon Hoboken [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  | $ 67,904 |
Mortgage notes payable | Notes Payable Maturities 2019 [Member] | Avalon Columbia Pike [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $ 70,507 |  | $ 70,507 |  |  |
Restricted Stock Converted From Performance Shares [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Restricted stock granted (in shares) |  |  | 115,618 | 95,826 |  |
Restricted stock |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Restricted stock granted (in shares) |  |  | 80,873 | 61,953 |  |
Fair value of shares issued |  |  | $ 13,129 | $ 10,721 |  |
Stock Issued During Period, Shares, Share-based Compensation, Forfeited (in shares) |  |  | 3,848 |  |  |
Restricted Stock and Restricted Stock Converted From Performance Shares [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Restricted stock granted (in shares) |  |  | 196,491 | 157,779 |  |
Retained Earnings [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Change in redemption value of redeemable noncontrolling interest |  |  | $ (529) | $ 1,722 |  |
Deferred Compensation, Share-based Payments [Member] | Non Employee Director [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Fair value of shares issued |  |  | $ 3,894 | $ 3,552 |  |
Non Employee Director [Member] | Deferred Compensation, Share-based Payments [Member] |  |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |  |
Restricted stock granted (in shares) |  |  | 44,327 | 46,589 |  |

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