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Equity Investments in Ground Leases (Details) $ in Thousands		1 Months Ended			3 Months Ended
		Jan. 31, 2024 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 agreement	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)	Feb. 28, 2022 USD ($)	Jan. 31, 2022 lease	Nov. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Carrying value	[1]				$ 275,295		$ 310,320
Earnings from equity method investments					6,912	$ 2,262
Ground lease acquisition purchase price					32,158	50,803
Land and Related Ground Lease
Schedule of Equity Method Investments [Line Items]
Leasehold improvement allowance, funded amount					36,500
Ground Lease Plus Fund
Schedule of Equity Method Investments [Line Items]
Ground lease acquisition purchase price		$ 38,300
iStar Inc.
Schedule of Equity Method Investments [Line Items]
Value of land acquired											$ 33,300
Number of agreements entered into to acquire land and related Ground Lease | agreement				2
iStar Inc. | Multi-family project
Schedule of Equity Method Investments [Line Items]
Commitment to provide loan to Ground lessee												$ 75,000
iStar Inc. | Ground Lease Plus Fund
Schedule of Equity Method Investments [Line Items]
Gain (loss) from sale of Ground Lease			$ 0
Number of Ground Leases sold | lease										2
425 Park Avenue | Equity Method Venture
Schedule of Equity Method Investments [Line Items]
Carrying value					135,854		135,288
Earnings from equity method investments					$ 879	835
Ownership percentage					54.80%
32 Old Slip
Schedule of Equity Method Investments [Line Items]
Carrying value					$ 53,718		52,425
Earnings from equity method investments					1,425	$ 1,427
Ownership percentage				29.20%
Ground Lease Plus Fund
Schedule of Equity Method Investments [Line Items]
Carrying value					29,589		73,428
Earnings from equity method investments					889
Basis difference in equity investment to be amortized					19,200
Amortization of basis difference in equity investments					$ 200
Weighted average remaining term					106 years 3 months 18 days
Ownership percentage					53.00%
Leasehold Loan Fund
Schedule of Equity Method Investments [Line Items]
Carrying value					$ 56,134		$ 49,179
Earnings from equity method investments					3,719
Basis difference in equity investment to be amortized					10,200
Amortization of basis difference in equity investments					$ 1,000
Weighted average remaining term					2 years 9 months 18 days
Ownership percentage					53.00%
Leasehold Loan Fund | Life science property
Schedule of Equity Method Investments [Line Items]
Commitment to provide loan to Ground lessee									$ 130,000
Leasehold Loan Fund | Mixed-use property
Schedule of Equity Method Investments [Line Items]
Commitment to provide loan to Ground lessee								$ 105,000
Loan commitment to Ground lessee that has been funded					$ 40,800
Leasehold Loan Fund | Multi-family project
Schedule of Equity Method Investments [Line Items]
Loan commitment to Ground lessee that has been funded					$ 69,400
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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