Investments - Operating Lease Income (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
	Aug. 31, 2019	Sep. 30, 2018	Aug. 31, 2019	Sep. 30, 2018
Real Estate [Abstract]
Base cash rent	$ 30,679	$ 58,402	$ 127,663	$ 173,745
Variable cash rent (including reimbursables)	841	1,126	3,590	3,573
Straight-line rent, net of bad debt expense	(303)	844	1,546	2,482
Amortization of lease intangibles	30	(85)	13	(261)
Total rental income	$ 31,247	$ 60,287	$ 132,812	$ 179,539