Segments - Schedule of Reconciliation of NOI to Net Loss Income Attributable to Common Stockholders (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting [Abstract]
NOI	[1]	$ 479,675	$ 476,472	$ 475,601
Fee income		28,421	28,473	28,070
Depreciation and amortization expense		(232,517)	(232,487)	(235,200)
General and administrative expenses		(59,487)	(59,132)	(64,917)
Loss from real estate related fund investments		(2,233)	0	0
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		(45,141)	(43,597)	(48,631)
Loss from unconsolidated joint ventures		(53,251)	(24,896)	(18,619)
Interest and other income, net		5,174	3,017	4,490
Interest and debt expense		(143,864)	(142,014)	(144,208)
Adjustments related to discontinued operations (including loss on sale of real estate)				(8,390)
Other, net		(1,709)	(134)	(824)
(Loss) income from continuing operations, before income taxes		(24,932)	5,702	(12,628)
Income tax expense		(3,265)	(3,643)	(1,493)
(Loss) income from continuing operations, net		(28,197)	2,059	(14,121)
Loss from discontinued operations, net		0	0	(5,075)
Net (loss) income		(28,197)	2,059	(19,196)
Consolidated joint ventures		(13,981)	(21,538)	(9,257)
Consolidated real estate related funds		3,342	(2,893)	1,450
Operating Partnership		2,433	2,018	2,299
Net loss attributable to common stockholders		$ (36,403)	$ (20,354)	$ (24,704)

[1] NOI is used to measure the operating performance of our properties. NOI consists of rental revenue (which includes property rentals, tenant reimbursements and lease termination income) and certain other property-related revenue less operating expenses (which includes property-related expenses such as cleaning, security, repairs and maintenance, utilities, property administration and real estate taxes). We use NOI internally as a performance measure and believe it provides useful information to investors regarding our financial condition and results of operations because it reflects only those income and expense items that are incurred at the property level. Other real estate companies may use different methodologies for calculating NOI and, accordingly, our presentation of NOI may not be comparable to other real estate companies.