Loss Reserves (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan	Dec. 31, 2019 USD ($)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior years			$ 12,784	$ (33,164)
Prior years			77,820	$ 109,420
Percentage of prior year default inventory resolved				49.00%
Premium refund liability, expected claim payments	$ 28,000		$ 28,000		$ 30,000
Primary Delinquent Inventory [Roll Forward]
Delinquent inventory at the beginning of period (in loans) | loan	27,384	30,921	30,028	32,898
New notices (in loans) | loan	57,584	12,915	69,982	26,526
Cures (in loans) | loan	(14,964)	(12,882)	(29,077)	(27,230)
Paids (including those charged to a deductible or captive) (in loans) | loan	(661)	(1,112)	(1,558)	(2,300)
Rescissions and denials (in loans) | loan	(17)	(47)	(49)	(99)
Delinquent inventory at end of period (in loans) | loan	69,326	29,795	69,326	29,795
Probable loss on litigation claims paying practices
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior years				$ 23,500
Decrease in estimated claim rate on primary defaults
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior years			$ (2,104)	(67,465)
Increase in estimated severity on primary defaults
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior years			13,767	3,140
Change in estimates related to pool reserves, LAE reserves, reinsurance, and other
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior years			$ 1,121	$ 31,161