MORTGAGE AND OTHER INDEBTEDNESS - Schedule of Term Loans and Revolving Line of Credit (Details) $ in Thousands	6 Months Ended
Jun. 30, 2022 USD ($) extension	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Gross debt	$ 2,956,453	$ 3,092,225
Unsecured credit facility revolving line of credit
Debt Instrument [Line Items]
Gross debt	$ 0	$ 55,000
Interest rate	2.89%	1.20%
Number of extension options \| extension	2
Extension period	6 months
Extension fee percentage	0.00075
Unsecured term loans
Debt Instrument [Line Items]
Gross debt	$ 720,000	$ 720,000
Unsecured term loans \| Unsecured term loan due 2023
Debt Instrument [Line Items]
Gross debt	$ 200,000	$ 200,000
Interest rate	4.10%	4.10%
Fixed interest rate	2.85%
Unsecured term loans \| Unsecured term loan due 2023 \| LIBOR
Debt Instrument [Line Items]
Variable interest rate	1.25%	1.25%
Unsecured term loans \| Unsecured term loan due 2023 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Credit spread	1.20%
Unsecured term loans \| Unsecured term loan due 2023 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Credit spread	1.85%
Unsecured term loans \| Unsecured term loan due 2024
Debt Instrument [Line Items]
Gross debt	$ 120,000	$ 120,000
Interest rate	2.88%	2.88%
Fixed interest rate	1.68%
Unsecured term loans \| Unsecured term loan due 2024 \| LIBOR
Debt Instrument [Line Items]
Variable interest rate	1.20%	1.20%
Unsecured term loans \| Unsecured term loan due 2024 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Credit spread	1.20%
Unsecured term loans \| Unsecured term loan due 2024 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Credit spread	1.70%
Unsecured term loans \| Unsecured term loan due 2025
Debt Instrument [Line Items]
Gross debt	$ 250,000	$ 250,000
Interest rate	5.09%	5.09%
Fixed interest rate	5.09%
Number of extension options \| extension	3
Extension period	1 year
Unsecured term loans \| Unsecured term loan due 2026
Debt Instrument [Line Items]
Gross debt	$ 150,000	$ 150,000
Interest rate	2.97%	2.97%
Fixed interest rate	1.77%
Unsecured term loans \| Unsecured term loan due 2026 \| LIBOR
Debt Instrument [Line Items]
Variable interest rate	1.20%	1.20%
Unsecured term loans \| Unsecured term loan due 2026 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Credit spread	1.20%
Unsecured term loans \| Unsecured term loan due 2026 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Credit spread	1.70%

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- Definition

Debt Instrument, Maturity Date, Number of Extension Options

+ References

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- Definition

Debt Instrument, Maturity Extension Fee, Percentage of Borrowing Capacity

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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-Topic 210
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
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-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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