Notes Receivable - General Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying values		$ 69,788		$ 71,923
Transition adjustment		$ (1,083,411)		(911,092)
Credit loss	$ 7,811		$ 32,784
Bonds A Series [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity date of notes receivable		Jul. 01, 2034
Bonds B Series [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity date of notes receivable		Sep. 01, 2037
Credit loss	$ 7,811		$ 32,784
Bonds A and B Series [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying values		$ 69,800		$ 71,900
Credit loss reserve		$ 38,000