Reinsurance - Total VIE Assets and Liabilities of Eagle Re Issuers (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Ceded Credit Risk [Line Items]
Total assets	$ 7,593,933	$ 7,063,729
Total liabilities	3,196,128	3,144,402
Variable Interest Entity, Primary Beneficiary
Ceded Credit Risk [Line Items]
Total assets	964,909	1,866,809
Total liabilities	964,909	1,866,809
Eagle Re 2021-2 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance
Ceded Credit Risk [Line Items]
Total assets	354,947	471,942
Total liabilities	354,947	471,942
Eagle Re 2023-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance
Ceded Credit Risk [Line Items]
Total assets	353,077	0
Total liabilities	353,077	0
Eagle Re 2021-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance
Ceded Credit Risk [Line Items]
Total assets	250,268	366,169
Total liabilities	250,268	366,169
Eagle Re 2020-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance
Ceded Credit Risk [Line Items]
Total assets	6,617	368,378
Total liabilities	6,617	368,378
Eagle Re 2019-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance
Ceded Credit Risk [Line Items]
Total assets	0	384,602
Total liabilities	0	384,602
Eagle Re 2018-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance
Ceded Credit Risk [Line Items]
Total assets	0	275,718
Total liabilities	$ 0	$ 275,718