Revenue Recognition (Schedule of Revenues by Segment ) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Total revenues	Total revenues	Total revenues
Lease income	$ 1,508,044	$ 1,544,671	$ 1,543,317
Total revenues	1,787,686	1,811,163	1,799,995
Tenant settlement		21,350
Non- controlling Interests in Consolidated Subsidiaries
Disaggregation of Revenue [Line Items]
Tenant settlement		6,405
Rental revenues
Disaggregation of Revenue [Line Items]
Total revenues	1,568,806	1,607,486	1,607,685
Lease revenues
Disaggregation of Revenue [Line Items]
Lease income	1,508,044	1,544,671	1,543,317
Property rentals
Disaggregation of Revenue [Line Items]
Lease income	1,486,503	1,523,890	1,510,648
Trade shows
Disaggregation of Revenue [Line Items]
Lease income	21,541	20,781	32,669
Tenant services
Disaggregation of Revenue [Line Items]
Revenues	41,549	42,460	45,211
Parking revenues
Disaggregation of Revenue [Line Items]
Revenues	19,213	20,355	19,157
Fee and other income
Disaggregation of Revenue [Line Items]
Revenues	218,880	203,677	192,310
Total revenues	218,880	203,677	192,310
BMS cleaning fees
Disaggregation of Revenue [Line Items]
Revenues	149,225	141,937	137,673
Management and leasing fees
Disaggregation of Revenue [Line Items]
Revenues	14,680	13,040	11,039
Other income
Disaggregation of Revenue [Line Items]
Revenues	54,975	48,700	43,598
New York
Disaggregation of Revenue [Line Items]
Total revenues	1,471,997	1,452,158	1,449,442
New York | Rental revenues
Disaggregation of Revenue [Line Items]
Total revenues	1,260,426	1,269,817	1,280,181
New York | Lease revenues
Disaggregation of Revenue [Line Items]
Lease income	1,215,854	1,222,229	1,230,851
New York | Property rentals
Disaggregation of Revenue [Line Items]
Lease income	1,215,854	1,222,229	1,230,851
New York | Trade shows
Disaggregation of Revenue [Line Items]
Lease income	0	0	0
New York | Tenant services
Disaggregation of Revenue [Line Items]
Revenues	29,344	31,086	33,351
New York | Parking revenues
Disaggregation of Revenue [Line Items]
Revenues	15,228	16,502	15,979
New York | Fee and other income
Disaggregation of Revenue [Line Items]
Revenues	211,571	182,341	169,261
New York | BMS cleaning fees
Disaggregation of Revenue [Line Items]
Revenues	159,903	151,608	146,530
New York | Management and leasing fees
Disaggregation of Revenue [Line Items]
Revenues	15,443	13,619	11,645
New York | Other income
Disaggregation of Revenue [Line Items]
Revenues	36,225	17,114	11,086
Other
Disaggregation of Revenue [Line Items]
Total revenues	315,689	359,005	350,553
Other | Rental revenues
Disaggregation of Revenue [Line Items]
Total revenues	308,380	337,669	327,504
Other | Lease revenues
Disaggregation of Revenue [Line Items]
Lease income	292,190	322,442	312,466
Other | Property rentals
Disaggregation of Revenue [Line Items]
Lease income	270,649	301,661	279,797
Other | Trade shows
Disaggregation of Revenue [Line Items]
Lease income	21,541	20,781	32,669
Other | Tenant services
Disaggregation of Revenue [Line Items]
Revenues	12,205	11,374	11,860
Other | Parking revenues
Disaggregation of Revenue [Line Items]
Revenues	3,985	3,853	3,178
Other | Fee and other income
Disaggregation of Revenue [Line Items]
Revenues	7,309	21,336	23,049
Other | BMS cleaning fees
Disaggregation of Revenue [Line Items]
Revenues	(10,678)	(9,671)	(8,857)
Other | Management and leasing fees
Disaggregation of Revenue [Line Items]
Revenues	(763)	(579)	(606)
Other | Other income
Disaggregation of Revenue [Line Items]
Revenues	$ 18,750	$ 31,586	$ 32,512