Leases (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2021 USD ($) Property	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Operating Leased Assets [Line Items]
Fixed and in-substance fixed lease income		$ 797,502	$ 807,603	$ 813,444
Variable lease income		262,619	247,384	247,861
Uncollectible straight line rent	[1]	5,227	(34,673)	(7,002)
Uncollectible amounts billable in lease income	[1]	23,481	(82,367)	(5,394)
Total lease income		1,113,368	980,166	1,094,301
2022		793,177
2023		710,472
2024		609,200
2025		501,333
2026		398,196
Thereafter		1,409,012
Total		$ 4,421,390
Number of Properties Subject to Ground Leases | Property		20
Last Ground Lease Expiration Date		2101
Last Office Lease Expiration Date		2029
Operating Lease, Expense		$ 19,818	19,679	20,456
Variable Lease, Cost		1,647	1,629	2,245
Operating cash flows for operating leases		15,165	15,003	14,815
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months		14,564
Lessee, Operating Lease, Liability, Payments, Due Year Two		14,098
Lessee, Operating Lease, Liability, Payments, Due Year Three		13,556
Lessee, Operating Lease, Liability, Payments, Due Year Four		13,388
Lessee, Operating Lease, Liability, Payments, Due Year Five		13,136
Lessee, Operating Lease, Liability, Payments, Due after Year Five		529,436
Lessee, Operating Lease, Total Undiscounted Lease Liabilities		598,178
Lessee, Operating Lease, Present Value Discount		(382,390)
Lease liabilities		215,788	220,390
Lessor [Member]
Operating Leased Assets [Line Items]
Above/below market rent and tenant rent inducement amortization, net		24,539	42,219	45,392
Ground Lease [Member]
Operating Leased Assets [Line Items]
Operating Lease, Expense		13,862	13,716	13,982
Variable Lease, Cost		1,032	1,044	1,693
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months		10,562
Lessee, Operating Lease, Liability, Payments, Due Year Two		10,775
Lessee, Operating Lease, Liability, Payments, Due Year Three		10,824
Lessee, Operating Lease, Liability, Payments, Due Year Four		10,827
Lessee, Operating Lease, Liability, Payments, Due Year Five		10,748
Lessee, Operating Lease, Liability, Payments, Due after Year Five		527,860
Lessee, Operating Lease, Total Undiscounted Lease Liabilities		581,596
Lessee, Operating Lease, Present Value Discount		(381,062)
Lease liabilities		$ 200,534
Operating Lease, Weighted Average Discount Rate, Percent		5.20%
Operating Lease, Weighted Average Remaining Lease Term		47 years 8 months 12 days
Office Lease [Member]
Operating Leased Assets [Line Items]
Operating Lease, Expense		$ 4,309	4,334	4,229
Variable Lease, Cost		615	585	552
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months		4,002
Lessee, Operating Lease, Liability, Payments, Due Year Two		3,323
Lessee, Operating Lease, Liability, Payments, Due Year Three		2,732
Lessee, Operating Lease, Liability, Payments, Due Year Four		2,561
Lessee, Operating Lease, Liability, Payments, Due Year Five		2,388
Lessee, Operating Lease, Liability, Payments, Due after Year Five		1,576
Lessee, Operating Lease, Total Undiscounted Lease Liabilities		16,582
Lessee, Operating Lease, Present Value Discount		(1,328)
Lease liabilities		$ 15,254
Operating Lease, Weighted Average Discount Rate, Percent		3.40%
Operating Lease, Weighted Average Remaining Lease Term		4 years 9 months 18 days
Fixed Lease Expense [Member]
Operating Leased Assets [Line Items]
Operating Lease, Expense		$ 18,171	$ 18,050	$ 18,211

[1] During the year ended December 31, 2021, the Company had improved rent collections following decreases in governmental operating restrictions on certain businesses which resulted in more favorable income than we experienced in 2020 during the height of the pandemic.