CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2020	Dec. 31, 2019	Feb. 26, 2019
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred shares, liquidation preference (in dollars per share)	$ 25
Preferred units, shares issued (in shares)	3,881,000
Preferred shares of beneficial interest, shares outstanding (in shares)	3,881,000	4,100,000
Preferred shares liquidation preference	$ 97,000,000.0
Common shares of beneficial interest, shares issued (in shares)	12,976,000	12,098,000
Common shares of beneficial interest, shares outstanding (in shares)	12,976,000	12,098,000
Noncontrolling interests - operating partnership (in shares)	1,018,000	1,058,000
Series D Preferred Units
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred units, par value (in dollars per share)	$ 100	$ 100
Preferred units, shares issued (in shares)	166,000		165,600
Preferred units, shares outstanding (in shares)		166,000
Preferred units, liquidation preference	$ 16,560,000	$ 16,560,000
Series C Preferred Shares Of Beneficial Interest
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred units, shares issued (in shares)		4,118,000
Preferred shares liquidation preference	97,036,000	$ 102,971,000
Term Loans
LIABILITIES
Unamortized loan costs	798,000	942,000
Mortgages
LIABILITIES
Unamortized loan costs	$ 1,446,000	$ 1,712,000

Number of partnership units held by noncontrolling interests as of the balance sheet date.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

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