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Basis of Presentation and Significant Accounting Policies - Deferred Policy Acquisition Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | $ 229,828 | $ 276,668
Property and Casualty |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | 26,153 | 28,616
Supplemental |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | 4,270 | 1,967
Retirement |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | 137,735 | 185,294
Life |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | $ 61,670 | $ 60,791

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