Statutory Information - Surplus Additions (Distributions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Radian Guaranty
Statutory Surplus [Line Items]
Distributions from Radian Guaranty surplus and from other insurance subsidiaries' surplus	$ (400,000)	$ (881,979)	$ 0
Return of capital		782,000
Repayments of debt		$ 100,000
Interest rate on senior notes		0.00%
Other mortgage insurance subsidiaries
Statutory Surplus [Line Items]
Distributions from Radian Guaranty surplus and from other insurance subsidiaries' surplus	0	$ (32,500)	(40,000)
Additions to Radian Guaranty surplus and to other insurance subsidiaries' surplus	$ 250	$ 0	$ 250