Loss Reserves - Reconciliation of Beginning and Ending Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Loss Reserve [Roll Forward]
Reserve at beginning of period	$ 505,379	$ 557,988
Less reinsurance recoverable	33,302	28,240
Net reserve at beginning of period	472,077	529,748
Losses and LAE incurred in respect of delinquency notices received in:
Current year	53,436	47,212
Prior years	(48,881)	(40,766)
Total losses incurred	4,555	6,446
Losses and LAE paid in respect of delinquency notices received in:
Current year	0	0
Prior years	11,385	10,440
Total losses paid	11,385	10,440
Net reserve at end of period	465,247	525,754
Plus reinsurance recoverable	39,200	32,761
Reserve at end of period	$ 504,447	$ 558,515