Corporate Indebtedness - Senior Unsecured Notes (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Debt disclosures by scheduled maturity date
Accreted Balance	$ 1,243,649	$ 1,641,552
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	100,000
Accreted Balance	100,000	100,000
Deferred financing costs, net	(231)	(308)
Accreted Balance, net of deferred financing costs	99,769	99,692
Senior unsecured notes | 4.27% Senior unsecured notes maturing on December 17, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	100,000
Accreted Balance	$ 100,000	$ 100,000
Coupon Rate (as a percent)	4.27%
Initial Term (in Years)	10 years