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Fair Value Measurements (Summary of Derivative Instruments) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	May 10, 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 Cap \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	$ 4,994,000
Derivative Asset, Notional Amount	1,515,000,000
Interest Rate Cap \| Other \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	95,000	$ 17,000
Derivative Asset, Notional Amount	175,000,000	175,000,000
Interest rate swaps \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value	50,818,000	66,033,000
Derivative Liability, Notional Amount	850,000,000	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	3,041,000
Derivative Asset, Notional Amount	$ 840,000,000
Derivative, Interest Rate	2.01%
Derivative, Swap Rate	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
Interest rate swaps \| PENN 11 mortgage loan interest rate swap \| Other Assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	$ 1,858,000
Derivative Asset, Notional Amount	$ 500,000,000
Derivative, Interest Rate	2.83%
Derivative, Swap Rate	3.03%
Interest rate swaps \| Unsecured term loan \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value	$ 44,732,000	57,723,000
Derivative Liability, Notional Amount	$ 750,000,000	$ 750,000,000
Derivative, Interest Rate	1.10%	1.15%
Derivative, Swap Rate	3.87%	3.87%
Derivative expiration date	2023-10	2023-10
Interest rate swaps \| 33-00 Northern Boulevard mortgage loan \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value	$ 6,086,000	$ 8,310,000
Derivative Liability, Notional Amount	$ 100,000,000	$ 100,000,000
Derivative, Interest Rate	1.89%	1.95%
Derivative, Swap Rate	4.14%	4.14%
Derivative expiration date	2025-01	2025-01
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	1.93%
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	2.75%
Derivative expiration date	2024-03
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%
Interest rate swaps \| LIBOR \| 33-00 Northern Boulevard mortgage loan \| Other liabilities \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Basis Spread on Variable Rate	1.80%	1.80%
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%