Loss Reserves - Reconciliation of Changes in Loss Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loss Reserve [Roll Forward]
Reserve at beginning of year	$ 557,988	$ 883,522	$ 880,537
Less reinsurance recoverable	28,240	66,905	95,042
Net reserve at beginning of year	472,077	529,748	816,617	$ 785,495
Losses and LAE incurred in respect of delinquent notices received in:
Current year	187,658	149,565	124,592
Prior years	(208,514)	(404,130)	(60,015)
Total losses incurred	(20,856)	(254,565)	64,577
Losses and LAE paid in respect of delinquent notices received in:
Current year	566	362	664
Prior years	45,645	49,626	68,769
Reinsurance terminations	(9,396)	(17,684)	(35,978)
Total losses paid	36,815	32,304	33,455
Net reserve at end of year	472,077	529,748	816,617
Plus reinsurance recoverables	33,302	28,240	66,905
Reserve at end of year	$ 505,379	$ 557,988	$ 883,522