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Summary of Significant Accounting Policies - Deferred Policy Acquisition Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | $ 276,668 | $ 298,742
Property and Casualty |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | 28,616 | 30,033
Supplemental |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | 1,967 |
Retirement (annuity) |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | 185,294 | 209,231
Life |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | $ 60,791 | $ 59,478

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