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Interest and Other Investment Income, Net (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Net Investment Income [Line Items]
Increase (decrease) in fair value of marketable securities:			$ 0	$ (17,102,000)	$ 0
Interest on loans receivable		$ 6,205,000	2,102,000	6,948,000	2,845,000
Dividends on marketable securities		3,353,000	3,307,000	6,706,000	6,614,000
Other, net		5,450,000	3,132,000	9,956,000	5,777,000
Interest and other investment income, net		30,892,000	8,541,000	6,508,000	15,236,000
Mezzanine loan		1,672,911,000		1,672,911,000		$ 1,592,348,000
Lexington Realty Trust
Net Investment Income [Line Items]
Increase (decrease) in fair value of marketable securities:		15,883,000	0	(16,992,000)	0
Other
Net Investment Income [Line Items]
Increase (decrease) in fair value of marketable securities:		$ 1,000	$ 0	$ (110,000)	$ 0
701 Seventh Avenue
Net Investment Income [Line Items]
Interest on loans receivable	$ 5,457,000
Mezzanine Loan \| 701 Seventh Avenue
Net Investment Income [Line Items]
Percentage of participation in loan		25.00%		25.00%
Mezzanine loan		$ 137,500,000		$ 137,500,000