Deconsolidation of Subsidiaries - Fair Value of Investment in Lamington (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019	Aug. 16, 2019
Investment in Deconsolidated Subsidiary [Roll Forward]
Investment in Lamington at December 1, 2018	[1]			$ 137,849
Change in fair value		$ 0	$ 90,710	0	$ 37,941
Investment in Lamington at August 16, 2019		$ 152,450		$ 152,450
Lamington
Investment in Deconsolidated Subsidiary [Roll Forward]
Investment in Lamington at December 1, 2018					$ 128,795	$ 128,795
Change in fair value						37,941
Investment in Lamington at August 16, 2019						$ 166,736

[1] Derived from audited consolidated financial statements.