Investment in Limited Partnership - Funds in the Premium/Expense Reserve Account (Details) $ in Thousands	3 Months Ended
	Feb. 29, 2020 USD ($)
Investments in and Advances to Affiliates [Line Items]
Premiums and expenses	$ 26,226
Class B Interests
Investments in and Advances to Affiliates [Line Items]
Premiums and expenses	2,000
First
Investments in and Advances to Affiliates [Line Items]
Premiums and expenses	24,226
Second | Class B Interests
Investments in and Advances to Affiliates [Line Items]
Premiums and expenses	2,000
Third | Class B Interests
Investments in and Advances to Affiliates [Line Items]
Premiums and expenses	0
Fourth
Investments in and Advances to Affiliates [Line Items]
Premiums and expenses	$ 0