Nominal or face amount used to calculate payments on the derivative asset.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Fixed interest rate related to the interest rate derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal or face amount used to calculate payment on derivative.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Debt (Interest Rate Hedging Activities) (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Long term debt	$ 2,559,169,000	$ 2,562,604,000
770 Broadway mortgage loan \| Interest rate swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 700,000,000
All-In Swapped Rate	4.98%
Derivative asset, notional amount	$ 700,000,000
770 Broadway mortgage loan \| Interest rate swaps \| Designated as Hedging Instrument \| Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Variable Rate Spread	2.25%
Unsecured revolving credit facility \| Interest rate swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 575,000,000
All-In Swapped Rate	3.88%
Derivative asset, notional amount	$ 575,000,000
Unsecured revolving credit facility \| Interest rate swaps \| Designated as Hedging Instrument \| Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Variable Rate Spread	1.15%
Unsecured Term Loan Maturing August 2027 \| Interest rate swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 50,000,000
All-In Swapped Rate	4.04%
Derivative asset, notional amount	$ 50,000,000
Unsecured Term Loan Maturing August 2027 \| Interest rate swaps \| Designated as Hedging Instrument \| Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Variable Rate Spread	1.30%
Unsecured term loan (effective 10/23) \| Interest rate swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 500,000,000
All-In Swapped Rate	4.39%
Unsecured term loan (effective 10/23) \| Interest rate swaps \| Designated as Hedging Instrument \| Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Variable Rate Spread	1.30%
100 West 33rd Street mortgage loan \| Interest rate swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 480,000,000
All-In Swapped Rate	5.06%
Derivative asset, notional amount	$ 480,000,000
100 West 33rd Street mortgage loan \| Interest rate swaps \| Designated as Hedging Instrument \| Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Variable Rate Spread	1.65%
888 Seventh Avenue mortgage loan \| Interest rate swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 200,000,000
All-In Swapped Rate	4.66%
Derivative asset, notional amount	$ 200,000,000
Long term debt	$ 83,200,000
888 Seventh Avenue mortgage loan \| Interest rate swaps \| Designated as Hedging Instrument \| LIBOR
Derivative [Line Items]
Variable Rate Spread	1.70%
Unsecured Term Loan Expiring October 2023 \| Interest rate swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative asset, notional amount	$ 750,000,000
Unsecured term loan \| Interest rate swaps \| Designated as Hedging Instrument
Derivative [Line Items]
All-In Swapped Rate	4.05%
Derivative asset, notional amount	$ 800,000,000
Unsecured term loan \| Interest rate swaps \| Designated as Hedging Instrument \| Other Assets
Derivative [Line Items]
Derivative asset, notional amount	$ 800,000,000
Unsecured Term Loan Portion Through October 2023 \| Interest rate swaps \| Designated as Hedging Instrument \| Other Assets
Derivative [Line Items]
All-In Swapped Rate	4.05%