Investments - Summary of Total Impairment (Recoveries) Recognized (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]
Real estate and intangible asset impairment	$ 12,795	$ 9,343	$ 38,655	$ 15,431
Recoveries of loan losses	(12,500)		(33,786)	(16)
Impairment, net of recoveries for loan losses	$ 295	$ 9,343	$ 4,869	$ 15,415