SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Preferred Stock and Preferred Units (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
Nov. 02, 2020	Dec. 31, 2020	Dec. 31, 2019
Shareholders Equity [Line Items]
Preferred stock authorized (shares)		15,000,000	15,000,000
Preferred stock, par value (USD per share)		$ 0.01	$ 0.01
Description of preferred stock dividend		In December 2019, the Company announced the suspension of all future dividends on its 7.375% Series D Cumulative Redeemable Preferred Stock and 6.625% Series E Cumulative Redeemable Preferred Stock.
Unpaid dividends of preferred stock accrued without interest		$ 37,410	$ 11,223
Series E Preferred Stock
Shareholders Equity [Line Items]
Preferred stock, par value (USD per share)		$ 0.01	$ 0.01
Depositary shares outstanding (shares)		6,900,000	6,900,000
Preferred stock dividend rate (as a percent)	6.625%	6.625%	6.625%
Preferred stock, liquidation preference per share (USD per share)		$ 250.00
Depositary shares, liquidation preference (USD per share)		25.00
Dividends in arrears per share (USD per share)		16.5625
Dividends in arrears per depositary share (USD per share)		1.65625
Redemption price per share (USD per share)		250.00
Cary Towne Center
Shareholders Equity [Line Items]
Preferred stock, par value (USD per share)		$ 0.01	$ 0.01
Depositary shares outstanding (shares)		18,150,000	18,150,000
Preferred stock dividend rate (as a percent)		7.375%	7.375%
Preferred stock, liquidation preference per share (USD per share)		$ 250.00
Depositary shares, liquidation preference (USD per share)		25.00
Dividends in arrears per share (USD per share)		18.4375
Dividends in arrears per depositary share (USD per share)		1.84375
Redemption price per share (USD per share)		$ 250.00

Description of preferred stock dividend.

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Preferred Stock Depositary Shares Outstanding

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Preferred Stock, Depository Shares Per Share Amounts of Preferred Dividends in Arrears

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Preferred Stock Liquidation Preference, Depositary Shares, Per Share

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Shareholders Equity [Line Items]

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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The percentage rate used to calculate dividend payments on preferred stock.

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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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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Per share amount of cumulative preferred dividends in arrears.

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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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