SECURED AND UNSECURED DEBT, NET - Credit Facilities (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) loan	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($) instrument	Aug. 31, 2021 USD ($) instrument
Revolving Credit Facility
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Total revolving credit facility	$ 1,300,000
Potential maximum available	$ 2,500,000
Number of Extensions of loan | loan	2
Extension period of option on loan	6 months
Revolving credit facility due 2023 | Letter of Credit
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Borrowings outstanding	$ 3,800	$ 2,300
Revolving credit facility due 2023 | Unsecured Debt
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Basis points added to to variable rate	0.755%
Commitment fee	0.15%
Revolving credit facility due 2023 | Unsecured Debt | Minimum
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Basis points added to to variable rate	0.70%
Commitment fee	0.10%
Revolving credit facility due 2023 | Unsecured Debt | Maximum
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Basis points added to to variable rate	1.40%
Commitment fee	0.30%
Revolving credit facility due 2023 | Revolving Credit Facility
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Total revolving credit facility	$ 1,300,000	1,300,000
Weighted average daily borrowings during the period ended		2,055
Maximum daily borrowings during the period ended		$ 250,000
Weighted average interest rate during the period ended		5.60%
Term Loan due September 2023 | Unsecured Debt
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Basis points added to to variable rate	0.83%
basis point subtracted from variable rate for Company receiving green building certifications	0.02%
Term Loan due September 2023 | Unsecured Debt | Minimum
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Basis points added to to variable rate	0.75%
Term Loan due September 2023 | Unsecured Debt | Maximum
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Basis points added to to variable rate	1.60%
Term Loan Facility Due January 2027
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Total revolving credit facility	$ 350,000
Term Loan Facility Due July 2025 | Unsecured Debt
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Notional			$ 350,000	$ 350,000
Number of interest rate swaps | instrument			5	5
March 2023 until January 2024 | Term Loan Facility Due July 2025 | Unsecured Debt
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Borrowings outstanding			$ 350,000	$ 350,000
All-in weighted average interest rate			3.36%	3.36%
January 2024 until July 2024 | Term Loan Facility Due July 2025 | Unsecured Debt
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Borrowings outstanding			$ 262,500	$ 262,500
All-in weighted average interest rate			2.68%	2.68%
July 2024 until July 2025 | Term Loan Facility Due July 2025 | Unsecured Debt
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Borrowings outstanding			$ 175,000	$ 175,000
All-in weighted average interest rate			1.43%	1.43%