Investments In and Advances To Affiliates Consolidated Variable Interest Entity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2021 USD ($) ft²	Dec. 31, 2020 USD ($)
Consolidated Variable Interest Entity [Abstract]
Rentable square feet of office property under development (in sq feet) | ft²		600,000
Assets and liabilities of consolidated variable interest entity [Abstract]
Net real estate assets		$ 5,032,033	$ 4,421,285
Development in-process	$ 172,706	6,890	259,681
Cash and cash equivalents	$ 9,505	23,152	109,322
Accrued straight-line rents receivable		268,324	259,381
Deferred leasing costs, net		258,902	209,329
Prepaid expenses and other assets		78,551	62,885
Accounts payable, accrued expenses and other liabilities		$ 294,976	268,727
Ownership Percentage [Member]
Consolidated Variable Interest Entity [Abstract]
Partner's interest in consolidated joint venture (in hundredths)		50.00%
Consolidated Variable Interest Entity [Member]
Consolidated Variable Interest Entity [Abstract]
Rentable square feet of office property under development (in sq feet) | ft²	150,000
Total anticipated development costs	$ 71,300
Contribution of cash to acquire interest in joint venture	$ 20,000
Percentage of equity interest in consolidated affiliates	80.00%
Partner's contribution of property to acquire interest in joint venture	$ 5,000
Advance to affiliate	$ 46,300
Interest rate, basis spread (in hundredths)	2.50%
Amount of loan funded to affiliate		$ 28,500
Assets and liabilities of consolidated variable interest entity [Abstract]
Net real estate assets		53,191	0
Development in-process		0	46,873
Cash and cash equivalents		389	0
Accrued straight-line rents receivable		121	0
Deferred leasing costs, net		1,519	196
Prepaid expenses and other assets		163	75
Accounts payable, accrued expenses and other liabilities		$ 646	$ 2,693
Consolidated Variable Interest Entity [Member] | Ownership Percentage [Member]
Consolidated Variable Interest Entity [Abstract]
Partner's interest in consolidated joint venture (in hundredths)	20.00%	20.00%
London Interbank Offered Rate (LIBOR) [Member] | Consolidated Variable Interest Entity [Member]
Consolidated Variable Interest Entity [Abstract]
Interest rate basis	LIBOR