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Revenue Recognition (Schedule of Revenues by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Total revenues Total revenues Total revenues Total revenues
Lease revenues $ 389,369 $ 368,176 $ 771,856 $ 757,126
Total revenues 462,242 441,437 921,347 903,016
Rental revenues        
Disaggregation of Revenue [Line Items]        
Revenue 405,073 382,252 804,257 787,007
Total revenues 405,073 382,252 804,257 787,007
Lease revenues        
Disaggregation of Revenue [Line Items]        
Lease revenues 389,369 368,176 771,856 757,126
Property rentals        
Disaggregation of Revenue [Line Items]        
Lease revenues 380,255 360,167 753,610 742,681
Trade shows        
Disaggregation of Revenue [Line Items]        
Lease revenues 6,577 6,415 13,179 12,851
Sales-type lease income        
Disaggregation of Revenue [Line Items]        
Lease revenues 2,537 1,594 5,067 1,594
Tenant services        
Disaggregation of Revenue [Line Items]        
Revenue 10,497 9,084 22,029 20,019
Parking revenues        
Disaggregation of Revenue [Line Items]        
Revenue 5,207 4,992 10,372 9,862
Fee and other income        
Disaggregation of Revenue [Line Items]        
Revenue 57,169 59,185 117,090 116,009
Total revenues 57,169 59,185 117,090 116,009
BMS cleaning fees        
Disaggregation of Revenue [Line Items]        
Revenue 33,344 37,431 72,687 73,907
Management and leasing fees        
Disaggregation of Revenue [Line Items]        
Revenue 2,658 2,926 5,373 5,956
Other income        
Disaggregation of Revenue [Line Items]        
Revenue 21,167 18,828 39,030 36,146
New York        
Disaggregation of Revenue [Line Items]        
Total revenues 380,316 356,522 757,802 731,068
New York | Rental revenues        
Disaggregation of Revenue [Line Items]        
Revenue 327,829 301,778 648,374 624,450
New York | Lease revenues        
Disaggregation of Revenue [Line Items]        
Lease revenues 316,437 291,340 624,490 602,028
New York | Property rentals        
Disaggregation of Revenue [Line Items]        
Lease revenues 313,900 289,746 619,423 600,434
New York | Trade shows        
Disaggregation of Revenue [Line Items]        
Lease revenues 0 0 0 0
New York | Sales-type lease income        
Disaggregation of Revenue [Line Items]        
Lease revenues 2,537 1,594 5,067 1,594
New York | Tenant services        
Disaggregation of Revenue [Line Items]        
Revenue 7,373 6,497 15,837 14,657
New York | Parking revenues        
Disaggregation of Revenue [Line Items]        
Revenue 4,019 3,941 8,047 7,765
New York | Fee and other income        
Disaggregation of Revenue [Line Items]        
Revenue 52,487 54,744 109,428 106,618
New York | BMS cleaning fees        
Disaggregation of Revenue [Line Items]        
Revenue 35,848 39,744 77,917 78,241
New York | Management and leasing fees        
Disaggregation of Revenue [Line Items]        
Revenue 2,701 3,150 5,623 6,355
New York | Other income        
Disaggregation of Revenue [Line Items]        
Revenue 13,938 11,850 25,888 22,022
Other        
Disaggregation of Revenue [Line Items]        
Total revenues 81,926 84,915 163,545 171,948
Other | Rental revenues        
Disaggregation of Revenue [Line Items]        
Revenue 77,244 80,474 155,883 162,557
Other | Lease revenues        
Disaggregation of Revenue [Line Items]        
Lease revenues 72,932 76,836 147,366 155,098
Other | Property rentals        
Disaggregation of Revenue [Line Items]        
Lease revenues 66,355 70,421 134,187 142,247
Other | Trade shows        
Disaggregation of Revenue [Line Items]        
Lease revenues 6,577 6,415 13,179 12,851
Other | Sales-type lease income        
Disaggregation of Revenue [Line Items]        
Lease revenues 0 0 0 0
Other | Tenant services        
Disaggregation of Revenue [Line Items]        
Revenue 3,124 2,587 6,192 5,362
Other | Parking revenues        
Disaggregation of Revenue [Line Items]        
Revenue 1,188 1,051 2,325 2,097
Other | Fee and other income        
Disaggregation of Revenue [Line Items]        
Revenue 4,682 4,441 7,662 9,391
Other | BMS cleaning fees        
Disaggregation of Revenue [Line Items]        
Revenue (2,504) (2,313) (5,230) (4,334)
Other | Management and leasing fees        
Disaggregation of Revenue [Line Items]        
Revenue (43) (224) (250) (399)
Other | Other income        
Disaggregation of Revenue [Line Items]        
Revenue $ 7,229 $ 6,978 $ 13,142 $ 14,124