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Fair Value Measurements (Schedule of Derivative Instruments) (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended
Jan. 07, 2026
Jan. 06, 2026
May 31, 2027
Jun. 30, 2026
Apr. 05, 2026
Dec. 31, 2025
Derivative [Line Items]            
Long term debt       $ 2,599,970   $ 2,264,959
Designated as a Hedge            
Derivative [Line Items]            
Fair Value Asset       $ 33,908   13,985
Fair Value Liability           3,093
Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Basis spread on variable rate       1.15%    
555 California Street mortgage loan | Office | 555 California Street            
Derivative [Line Items]            
Percentage share of mortgage loan       70.00%    
Debt amount       $ 1,200,000    
555 California Street mortgage loan | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Notional amount and swapped balance       $ 840,000    
All-In Swapped Rate       5.56%    
Fair Value Asset       $ 10,244   0
Fair Value Liability           2,119
Unsecured term loan            
Derivative [Line Items]            
Debt amount $ 850,000 $ 800,000        
Basis spread on variable rate 1.15% 1.25%        
Unsecured term loan | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Notional amount and swapped balance       $ 750,000    
All-In Swapped Rate       4.12%    
Fair Value Asset       $ 4,256   3,522
Fair Value Liability           0
Unsecured revolving credit facilities | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Notional amount and swapped balance       $ 575,000    
All-In Swapped Rate       3.74%    
Fair Value Asset       $ 8,113   5,208
Fair Value Liability           0
One Park Avenue mortgage loan | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Notional amount and swapped balance       $ 500,000    
All-In Swapped Rate       4.52%    
Fair Value Asset       $ 6,124   4,189
Fair Value Liability           0
Long term debt       $ 25,000    
Derivative, basis spread on variable rate       1.78%    
Variable interest rate       5.41%    
Cap strike rate       5.20%    
100 West 33rd Street mortgage loan | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Notional amount and swapped balance       $ 480,000    
All-In Swapped Rate       5.26%    
Fair Value Asset       $ 2,485   0
Fair Value Liability           736
1290 Avenue of the Americas mortgage loan | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Notional amount and swapped balance       $ 200,000    
All-In Swapped Rate       4.58%    
Fair Value Asset       $ 2,289   1,047
Fair Value Liability           0
Long term debt       $ 750,000    
Derivative, basis spread on variable rate       1.62%    
Variable interest rate       5.25%    
Cap strike rate       4.00%    
435 Seventh Avenue mortgage loan | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Fair Value Asset       $ 0   0
Fair Value Liability           238
Derivative, notional amount         $ 75,000  
Various mortgage loans | Interest Rate Cap | Designated as a Hedge            
Derivative [Line Items]            
Fair Value Asset       397   19
Fair Value Liability           $ 0
Unsecured Term Loan Expiring October 2026 | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Notional amount and swapped balance       $ 750,000    
All-In Swapped Rate       4.12%    
Unswapped Balance       $ 100,000    
Unsecured Term Loan Expiring July 2027 | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Notional amount and swapped balance       $ 250,000    
All-In Swapped Rate       3.89%    
Unswapped Balance       $ 600,000    
Unsecured Term Loan Expiring August 2027 | Interest Rate Swaps | Designated as a Hedge            
Derivative [Line Items]            
Notional amount and swapped balance       $ 50,000    
All-In Swapped Rate       3.89%    
Unswapped Balance       $ 800,000    
555 California Street, Forward Swap | Forecast            
Derivative [Line Items]            
Basis spread on variable rate     0.25%