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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) shares
Supplemental disclosures of non-cash investing and financing activities |  |  |
Common stock issued through the dividend reinvestment plan (in shares) | shares |  | 2,466 | 1,689
Common stock issued through the dividend reinvestment plan |  | $ 452 | $ 304
Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares) | shares |  | 60,165 | 53,214
Shares withheld to satisfy employees' tax withholding and other liabilities, value |  | $ 10,514 | $ 8,316
Stock issued during period, shares, share-based compensation, forfeited (in shares) | shares |  | 3,045 |
Stock issued during period, value, share-based compensation, forfeited |  | $ 528 | 627
Dividends declared but not paid | $ 185,384 | 196,079 | 185,384
Change in redemption value of redeemable noncontrolling interest |  | (458) |
Increase (decrease) in prepaid expense and other assets |  | 1,422 | (2,689)
Income (loss) on cash flow hedges | 719 | (15,654) | (73,826)
Increase in accrued expenses, other liabilities and accrued interest payable |  | 1,998 | 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 | 5,301 | 4,682
Net operating real estate |  | 15,767,760 |
Prepaid expenses and other assets |  | 277,122 |
Avalon Maplewood |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Net operating real estate |  | 16,361 |
Prepaid expenses and other assets |  | $ 2,965 |
Mortgage notes payable | Notes Payable Maturities 2020 | 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 |  | 67,904
Mortgage notes payable | Notes Payable Maturities 2020 | Avalon Columbia Pike |  |  |
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 and Restricted Stock Converted From Performance Shares |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Equity instruments granted (in shares) | shares |  | 201,314 | 196,491
Restricted Stock Converted From Performance Shares |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Equity instruments granted (in shares) | shares |  | 128,482 | 115,618
Restricted stock |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Equity instruments granted (in shares) | shares |  | 72,832 | 80,873
Fair value of shares issued |  | $ 13,079 | $ 13,129
Stock issued during period, shares, share-based compensation, forfeited (in shares) | shares |  | 3,045 | 3,848
Accumulated earnings less dividends |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Change in redemption value of redeemable noncontrolling interest |  | $ (458) | $ 529
Restricted stock and deferred stock awards | Non Employee Director |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Equity instruments granted (in shares) | shares |  |  | 44,327
Non Employee Director | Restricted stock and deferred stock awards |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |
Fair value of shares issued |  |  | $ 3,894

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