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Reinsurance - Effect of Reinsurance Programs (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Ceded Credit Risk [Line Items] |  |  |
Direct premiums written | $ 992,418,000 | $ 1,024,660,000 | $ 1,108,513,000
Ceded premiums written | (12,652,000) | (48,279,000) | (87,201,000)
Total net premiums written | 983,791,000 | 983,447,000 | 1,033,509,000
Direct premiums earned | 1,050,029,000 | 1,144,361,000 | 1,286,527,000
Assumed premiums earned | 4,025,000 | 7,066,000 | 12,214,000
Ceded premiums earned | (72,923,000) | (114,244,000) | (183,420,000)
Total net premiums earned | 981,131,000 | 1,037,183,000 | 1,115,321,000
Ceding commissions earned | 18,998,000 | 31,745,000 | 53,654,000
Ceded losses | (41,980,000) | (4,570,000) |
Ceded losses |  |  | 58,266,000
Deferred ceding commissions | 27,400,000 | 38,600,000 |
Mortgage insurance |  |  |
Ceded Credit Risk [Line Items] |  |  |
Direct premiums written | 967,996,000 | 984,995,000 | 1,085,670,000
Assumed premiums written | 4,025,000 | 7,066,000 | 12,197,000
Ceded premiums written | (12,148,000) | (47,515,000) | (86,912,000)
Direct premiums earned | 1,025,607,000 | 1,104,696,000 | 1,263,684,000
Assumed premiums earned | 4,025,000 | 7,066,000 | 12,214,000
Ceded premiums earned | (72,419,000) | (113,480,000) | (183,131,000)
Total net premiums earned | 957,213,000 | 998,282,000 | 1,092,767,000
Title insurance |  |  |
Ceded Credit Risk [Line Items] |  |  |
Direct premiums written | 24,422,000 | 39,665,000 | 22,843,000
Ceded premiums written | (504,000) | (764,000) | (289,000)
Direct premiums earned | 24,422,000 | 39,665,000 | 22,843,000
Ceded premiums earned | $ (504,000) | $ (764,000) | $ (289,000)

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