Unpaid Claims - Schedule of Activity in the Liability for Unpaid Claims and Claims Adjustment Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Roll Forward In Liability For Unpaid Claims And Claims Adjustment Expense [Abstract]
Beginning of period balance - gross and net	$ 103,976	$ 77,886
Incurred related to:
Current year	213,147	146,440
Prior years	1,285	(112)
Total incurred	214,432	146,328
Paid related to:
Current year	130,459	74,502
Prior years	70,367	59,359
Total paid	200,826	133,861
End of period balance - gross and net	$ 117,582	$ 90,353