Unpaid Claims - Schedule of Activity in the Liability for Unpaid Claims and Claims Adjustment Expense (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross and net balance, beginning of period	$ 103,976	$ 77,886
Incurred related to:
Current year	1,092,280	425,941
Prior years	17,095	(15,401)
Total incurred	1,109,375	410,540
Paid related to:
Current year	963,779	339,252
Prior years	109,362	55,559
Total paid	1,073,141	394,811
Gross and net balance, end of period	$ 140,210	$ 93,615