Notes Receivable - General Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying values		$ 71,972		$ 71,923
Transition adjustment		$ (1,074,872)		(911,092)
Credit loss	$ 19,145		$ 24,973
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	$ 19,145		$ 24,973
Bonds A and B Series [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying values		$ 72,000		$ 71,900
Credit loss reserve		$ 38,000