Fair Value Measurements (Summary of Derivative Instruments) (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Matures in May 2028 \| 555 California Street \| Office
Derivative [Line Items]
Equity method ownership percentage		70.00%
Debt instrument, amount		$ 1,200,000,000
Interest rate swaps \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value		32,837,000
Derivative Liability, Notional Amount		850,000,000
Interest rate swaps \| 555 California Mortgage Loan Interest Rate Swap \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	$ 36,322,000	11,814,000
Derivative Asset, Notional Amount	$ 840,000,000	$ 840,000,000
Derivative, Interest Rate	2.33%	2.04%
Derivative, Swap Rate	2.26%	2.26%
Interest rate swaps \| 555 California Mortgage Loan Interest Rate Swap \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative expiration date	2024-05	2024-05
Interest rate swaps \| PENN 11 mortgage loan interest rate swap \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	$ 19,825,000	$ 6,565,000
Derivative Asset, Notional Amount	$ 500,000,000	$ 500,000,000
Derivative, Interest Rate	2.24%	2.05%
Derivative, Swap Rate	2.23%	2.23%
Derivative expiration date	2024-03	2024-03
Interest rate swaps \| 33-00 Northern Boulevard mortgage loan interest rate swap \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	$ 296,000
Derivative Asset, Notional Amount	$ 100,000,000
Derivative, Interest Rate	2.11%
Derivative, Swap Rate	4.14%
Derivative expiration date	2025-01
Interest rate swaps \| 33-00 Northern Boulevard mortgage loan interest rate swap \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value		$ 3,861,000
Derivative Liability, Notional Amount		$ 100,000,000
Derivative, Interest Rate		1.91%
Derivative, Swap Rate		4.14%
Derivative expiration date		2025-01
Interest rate swaps \| Unsecured term loan \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value	$ 7,737,000	$ 28,976,000
Derivative Liability, Notional Amount	$ 750,000,000	$ 750,000,000
Derivative, Interest Rate	1.45%	1.10%
Derivative, Swap Rate	3.87%	3.87%
Derivative expiration date	2023-10	2023-10
Interest rate swaps \| LIBOR \| 555 California Mortgage Loan Interest Rate Swap \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Basis Spread on Variable Rate	0.0193%	0.0193%
Interest rate swaps \| LIBOR \| PENN 11 mortgage loan interest rate swap \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Basis Spread on Variable Rate	0.0195%	0.0195%
Interest rate swaps \| LIBOR \| 33-00 Northern Boulevard mortgage loan interest rate swap \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Basis Spread on Variable Rate	0.018%
Interest rate swaps \| LIBOR \| 33-00 Northern Boulevard mortgage loan interest rate swap \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Basis Spread on Variable Rate		0.018%
Interest rate swaps \| LIBOR \| Unsecured term loan \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Basis Spread on Variable Rate	0.01%	0.01%
Interest Rate Cap \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	$ 59,739,000	$ 18,929,000
Derivative Asset, Notional Amount	3,090,000,000	2,990,000,000
Interest Rate Cap \| Other \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	3,296,000	550,000
Derivative Asset, Notional Amount	1,650,000,000	1,650,000,000
Floating \| Interest rate swaps \| Unsecured term loan \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Notional Amount	$ 50,000,000	$ 50,000,000
Floating \| Interest rate swaps \| LIBOR \| Unsecured term loan \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Basis Spread on Variable Rate	1.00%	1.00%

Face (par) amount of debt instrument at time of issuance.

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Fixed interest rate related to the interest rate derivative.

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