Segments - Schedule of Reconciliation of NOI to Net Loss Income Attributable to Common Stockholders (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting [Abstract]
NOI	[1]	$ 476,472	$ 475,601	$ 494,009
Fee income		28,473	28,070	22,744
Depreciation and amortization expense		(232,487)	(235,200)	(240,104)
General and administrative expenses		(59,132)	(64,917)	(68,556)
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		(43,597)	(48,631)	(22,409)
Loss from unconsolidated joint ventures		(24,896)	(18,619)	(4,706)
Interest and other income, net		3,017	4,490	9,844
Interest and debt expense		(142,014)	(144,208)	(156,679)
Loss on early extinguishment of debt				(11,989)
Adjustments related to discontinued operations (including impairments and gain or loss on sale of real estate)			(8,390)	(15,292)
Other, net		(134)	(824)	(2,342)
Income (loss) from continuing operations, before income taxes		5,702	(12,628)	4,520
Income tax expense		(3,643)	(1,493)	(312)
Income (loss) from continuing operations, net		2,059	(14,121)	4,208
Loss from discontinued operations, net			(5,075)	(33,811)
Net income (loss)		2,059	(19,196)	(29,603)
Consolidated joint ventures		(21,538)	(9,257)	(11,022)
Consolidated real estate fund		(2,893)	1,450	(313)
Operating Partnership		2,018	2,299	4,039
Net loss attributable to common stockholders		$ (20,354)	$ (24,704)	$ (36,899)

[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.