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Segment Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues:      
Revenue, excluding third-party management and other fees $ 766,753 $ 738,221 $ 725,680
Intercompany rental revenue 0 0 0
Total revenues 766,753 738,221 725,680
Segment operating expenses:      
Property operating expenses 179,175 167,324 157,935
Observatory expenses 36,834 35,265 31,036
Other segment expenses 138,152 136,427 132,383
Total operating expenses 354,161 339,016 321,354
Total operating income 412,592 399,205 404,326
Segment assets 4,510,287 4,219,333 4,163,594
Intersegment Elimination      
Revenues:      
Revenue, excluding third-party management and other fees 0 0 0
Intercompany rental revenue (83,477) (80,514) (65,005)
Total revenues (83,477) (80,514) (65,005)
Segment operating expenses:      
Property operating expenses 0 0 0
Observatory expenses 0 0 0
Other segment expenses (83,477) (80,514) (65,005)
Total operating expenses (83,477) (80,514) (65,005)
Total operating income 0 0 0
Segment assets 0 0 0
Real Estate | Operating segments      
Revenues:      
Revenue, excluding third-party management and other fees 630,376 608,855 619,702
Intercompany rental revenue 83,477 80,514 65,005
Total revenues 713,853 689,369 684,707
Segment operating expenses:      
Property operating expenses 179,175 167,324 157,935
Observatory expenses 0 0 0
Other segment expenses 138,152 136,427 132,383
Total operating expenses 317,327 303,751 290,318
Total operating income 396,526 385,618 394,389
Segment assets 4,242,953 3,957,659 3,909,299
Observatory | Operating segments      
Revenues:      
Revenue, excluding third-party management and other fees 136,377 129,366 105,978
Intercompany rental revenue 0 0 0
Total revenues 136,377 129,366 105,978
Segment operating expenses:      
Property operating expenses 0 0 0
Observatory expenses 36,834 35,265 31,036
Other segment expenses 83,477 80,514 65,005
Total operating expenses 120,311 115,779 96,041
Total operating income 16,066 13,587 9,937
Segment assets $ 267,334 $ 261,674 $ 254,295