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Interest and Other Investment Income, Net (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2018	Jan. 31, 2014	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Investment Income [Line Items]
Increase (decrease) in fair value of marketable securities:			$ 1,312	$ 15,884	$ 1,773	$ (17,102)
Interest on cash and cash equivalents and restricted cash			2,626	4,487	4,693	8,044
Interest on loans receivable			1,635	6,205	3,241	6,948
Dividends on marketable securities			1,313	3,353	1,313	6,706
Other, net			954	963	1,865	1,912
Interest and other investment income, net			7,840	30,892	12,885	6,508
PREIT
Net Investment Income [Line Items]
Increase (decrease) in fair value of marketable securities:			1,313	0	(14,336)	0
Lexington Realty Trust
Net Investment Income [Line Items]
Increase (decrease) in fair value of marketable securities:			0	15,883	16,068	(16,992)
Other
Net Investment Income [Line Items]
Increase (decrease) in fair value of marketable securities:			$ (1)	$ 1	$ 41	$ (110)
701 Seventh Avenue
Net Investment Income [Line Items]
Interest on loans receivable	$ 5,457
Debt, percentage of participation for loan					25.00%
Loans payable		$ 137,500