Notes Receivable - General Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying values	$ 70,515		$ 71,923
Transition adjustment	$ (1,016,953)		(911,092)
Credit loss		$ 5,828
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		$ 5,828
Bonds A and B Series [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying values	$ 70,500		$ 71,900
Credit loss reserve	$ 38,000