Loss Reserves - Reconciliation of Beginning and Ending Balances (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Loss Reserve [Roll Forward]
Reserve at beginning of period	$ 557,988	$ 883,522
Less reinsurance recoverable	28,240	66,905
Net reserve at beginning of period	529,748	816,617
Losses and LAE incurred in respect of delinquency notices received in:
Current year	89,465	68,210
Prior years	(100,710)	(186,582)
Total losses incurred	(11,245)	(118,372)
Losses and LAE paid in respect of delinquency notices received in:
Current year	25	116
Prior years	22,272	24,909
Total losses paid	22,297	25,025
Net reserve at end of period	496,206	673,220
Plus reinsurance recoverable	34,475	53,958
Reserve at end of period	$ 530,681	$ 727,178