Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands					1 Months Ended		8 Months Ended	12 Months Ended
		Dec. 14, 2023 USD ($)	Dec. 07, 2023 USD ($) Rate	May 02, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 26, 2023 USD ($)
Derivative [Line Items]
Interest expense								$ 579,572	$ 437,139	$ 423,346
Losses from interest rate contracts								(79)
Interest rate swaps recorded upon consolidation								(7,337)	$ 0	$ 0
Santa Monica Business Park [Member]
Derivative [Line Items]
Ownership Percentage	[1]								55.00%
Joint Venture Partner [Member] | Santa Monica Business Park [Member]
Derivative [Line Items]
Ownership Percentage		45.00%
Santa Monica Business Park [Member] | Mortgages [Member]
Derivative [Line Items]
Debt		$ 300,000
Santa Monica Business Park [Member] | Mortgages [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Derivative [Line Items]
Debt		300,000
325 Main Street, 355 Main Street, 90 Broadway and Kendall Center Green Garage Properties [Member] | Mortgages [Member]
Derivative [Line Items]
Debt											$ 600,000
Derivative, All in interest rate | Rate			6.04%
Interest Rate Swap
Derivative [Line Items]
Derivative, Inception Date				May 02, 2023
Derivative, Notional Amount			$ 600,000	$ 1,200,000	$ 2,100,000	$ 2,100,000	$ 2,100,000	2,100,000
Derivative, Average Fixed Interest Rate				4.642%
Derivative, Maturity Date				May 16, 2024
Derivative, Number of Instruments Held			2	4
Interest expense							(4,200)
Interest Rate Swap | Santa Monica Business Park [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 300,000			300,000	300,000	300,000	$ 300,000
Derivative, Average Fixed Interest Rate		2.679%
Derivative, Maturity Date								Apr. 01, 2025
Derivative, Number of Instruments Held		3
Interest expense					(400)
Interest rate swaps recorded upon consolidation		$ 7,300
Interest Rate Swap | 325 Main Street, 355 Main Street, 90 Broadway and Kendall Center Green Garage Properties [Member]
Derivative [Line Items]
Derivative, Inception Date			Dec. 07, 2023
Derivative, Notional Amount			$ 600,000		$ 600,000	600,000	$ 600,000	$ 600,000
Derivative, Average Fixed Interest Rate			3.7925%
Derivative, Maturity Date			Oct. 26, 2028					Oct. 26, 2028
Derivative, Number of Instruments Held			3
Interest expense						$ (400)

[1] During the year ended December 31, 2023, the Company completed the acquisition of its joint venture partner’s 45% ownership interest in Santa Monica Business Park, as described below in this Note 6 and Note 3.