SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS (Details) - Summary of Valuation Allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation Allowance [Line Items]
Balance	$ 41,759	$ 31,552	$ 28,562
Charged to Costs and Expenses	36,989	43,482	56,345
Net Deductions and other	(32,074)	(33,275)	(53,355)
Balance	46,674	41,759	31,552
SEC Schedule, 12-09, Allowance, Uncollectible Premium Receivable [Member]
Valuation Allowance [Line Items]
Balance	3,394	2,149	10,940
Charged to Costs and Expenses	1,619	864	9,586
Net Deductions and other	(447)	381	(18,377)
Balance	4,566	3,394	2,149
SEC Schedule, 12-09, Allowance, Notes Receivable [Member]
Valuation Allowance [Line Items]
Balance	38,365	29,403	17,622
Charged to Costs and Expenses	35,370	42,618	46,759
Net Deductions and other	(31,627)	(33,656)	(34,978)
Balance	$ 42,108	$ 38,365	$ 29,403