Debt (Schedule of Principal Maturities of Mortgages Payable and Unsecured Debt) (Details) - USD ($) $ in Thousands	Jan. 15, 2025	Jan. 31, 2026	Jan. 07, 2026	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument
Long term debt				$ 2,264,959	$ 2,566,862
Mortgages Payable
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
2026				525,000
2027				880,000
2028				2,300,000
2029				0
2030				450,000
Thereafter				$ 470,000
Interest rate, effective percentage (in percent)				5.25%
Unsecured Debt
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
2026				$ 400,000
2027				1,520,420
2028				0
2029				0
2030				0
Thereafter				350,000
Senior unsecured notes
Debt Instrument
Long term debt				$ 747,202	1,195,914
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Interest rate, effective percentage (in percent)				2.73%
Senior unsecured notes | Subsequent Event
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Debt amount		$ 500,000
Senior Unsecured Notes due June 2026 | Subsequent Event
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Debt amount		400,000
Unsecured revolving credit facilities
Debt Instrument
Long term debt				$ 720,420	$ 575,000
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Interest rate, effective percentage (in percent)				4.05%
Debt amount				$ 720,420
Unsecured revolving credit facilities | Subsequent Event
Debt Instrument
Long term debt			$ 800,000
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Debt amount			$ 1,250,000
Mortgage, 606 Broadway
Debt Instrument
Long term debt				74,494
Mortgage , 888 Seventh Avenue
Debt Instrument
Long term debt				$ 244,543
Senior Unsecured Notes Due 2025 | Senior unsecured notes
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Repaid on loan	$ 450,000
One Park Avenue | Senior unsecured notes | Subsequent Event
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Maximum borrowing capacity		$ 525,000