SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Credit loss reserve on notes receivable
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS [Line items]
Additions Charged to Expenses/Other Accounts	$ 37,962
Balance at End of Year	37,962
Valuation allowance for deferred tax assets
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS [Line items]
Balance at Beginning of Year	12,387	$ 14,210	$ 14,616
Additions Charged to Expenses/Other Accounts	85,313
Net (Deductions) Recoveries		(1,823)	(406)
Balance at End of Year	$ 97,700	$ 12,387	$ 14,210