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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |
Common stock issued through the dividend reinvestment plan (in shares) |  |  | 1,713 | 2,466 |
Common stock issued through the dividend reinvestment plan |  |  | $ 290 | $ 452 |
Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares) |  |  | 67,963 | 60,165 |
Shares withheld to satisfy employees' tax withholding and other liabilities, value |  |  | $ 10,543 | $ 10,514 |
Stock issued during period, shares, share-based compensation, forfeited (in shares) |  |  | 4,622 |  |
Stock issued during period, value, share-based compensation, forfeited |  |  | $ 679 | 528 |
Dividends declared but not paid | $ 203,624 | $ 196,079 | 203,624 | 196,079 | $ 196,094
Change in redemption value of redeemable noncontrolling interest |  |  | (626) |  |
Cash flow hedge losses reclassified to earnings | (1,466) | (1,767) | (4,679) | (5,301) |
Increase (decrease) in prepaid expense and other assets |  |  |  | 1,422 |
Increase in accrued expenses, other liabilities and accrued interest payable |  |  |  | 1,998 |
Net operating real estate | $ 16,082,262 |  | $ 16,082,262 |  | $ 16,342,893
Avalon Maplewood [Member] |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |
Net operating real estate |  | $ 16,361 |  | $ 16,361 |
Restricted Stock and Restricted Stock Converted From Performance Shares |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |
Equity instruments granted (in shares) |  |  | 187,010 | 201,314 |
Restricted Stock Converted From Performance Shares |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |
Equity instruments granted (in shares) |  |  | 88,297 | 128,482 |
Restricted stock |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |
Equity instruments granted (in shares) |  |  | 98,713 | 72,832 |
Fair value of shares issued |  |  | $ 15,950 | $ 13,079 |
Stock issued during period, shares, share-based compensation, forfeited (in shares) |  |  | 4,622 | 3,045 |
Accumulated earnings less dividends |  |  |  |  |
Supplemental disclosures of non-cash investing and financing activities |  |  |  |  |
Change in redemption value of redeemable noncontrolling interest |  |  | $ (626) | $ 458 |

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