Significant Accounting Policies - Investments in Commercial Real Estate Properties (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Real Estate [Line Items]
Weighted average amortization period, above-market lease costs	6 years 3 months 18 days
Weighted average amortization period, below-market lease costs	7 years 4 months 24 days
Weighted average amortization period, in-place lease costs	8 years 1 month 6 days
Period from cessation of major construction activity to completion of construction project, maximum	1 year
Depreciation expense (including amortization of the capital lease asset)	$ 190,100,000	$ 187,300,000	$ 277,500,000
Amortization of above and below Market Leases	5,700,000	4,200,000	$ 5,900,000
Identified intangible assets (included in other assets):
Gross amount	403,552,000	199,722,000
Accumulated amortization	(190,066,000)	(182,643,000)
Net	213,486,000	17,079,000
Identified intangible liabilities (included in deferred revenue):
Gross amount	361,338,000	212,767,000
Accumulated amortization	(212,191,000)	(210,262,000)
Net	149,147,000	2,505,000
Net intangible assets reclassed to assets held for sale	0	1,800,000
Net intangible liabilities reclassed to liabilities relates to assets held for sale	0	$ 0
Other Identifiable Assets
Estimated annual amortization
2023	65,130,000
2024	38,982,000
2025	37,298,000
2026	31,381,000
2027	25,058,000
Acquired above-market leases, net of acquired below-market leases
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
2023	(23,580,000)
2024	(14,878,000)
2025	(14,760,000)
2026	(11,775,000)
2027	$ (11,029,000)
Minimum | Above Market Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | Below Market Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | In Place Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Maximum | Above Market Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | Below Market Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | In Place Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Building (fee ownership)
Real Estate [Line Items]
Estimated useful life (in years)	40 years
Building (leasehold interest) | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	40 years
Right of use assets - financing leases | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	40 years
Furniture and fixtures | Minimum
Real Estate [Line Items]
Estimated useful life (in years)	4 years
Furniture and fixtures | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	7 years
Building | Minimum
Real Estate [Line Items]
Estimated useful life (in years)	3 years
Building | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	40 years