CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Supplemental disclosures of non-cash investing and financing activities
Common stock issued through the dividend reinvestment plan (in shares)	566	1,165
Common stock issued through the dividend reinvestment plan	$ 96	$ 205
Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares)	67,609	57,172
Shares withheld to satisfy employees' tax withholding and other liabilities, value	$ 10,483	$ 10,149
Stock issued during period, shares, share-based compensation, forfeited (in shares)	1,829
Stock issued during period, value, share-based compensation, forfeited	$ 234	41
Dividends declared but not paid	203,166	195,657
Change in redemption value of redeemable noncontrolling interest	(63)
Increase (decrease) in prepaid expense and other assets		180
Increase in accrued expenses, other liabilities and accrued interest payable		102
Cash flow hedge losses reclassified to earnings	1,756	1,752
Net operating real estate	$ 16,251,023
Avalon Maplewood
Supplemental disclosures of non-cash investing and financing activities
Net operating real estate		16,361
Insurance Proceeds		$ 12,598
Restricted Stock and Restricted Stock Converted From Performance Shares
Supplemental disclosures of non-cash investing and financing activities
Equity instruments granted (in shares)	182,998	198,502
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)	94,701	70,020
Fair value of shares issued	$ 15,277	$ 12,538
Stock issued during period, shares, share-based compensation, forfeited (in shares)	1,829	236
Accumulated earnings less dividends
Supplemental disclosures of non-cash investing and financing activities
Change in redemption value of redeemable noncontrolling interest	$ (63)	$ 183

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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