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Investments - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Investment grade rating | 84.50% |
Limited partnership interests | $ 392,192 | $ 383,717
Fixed maturity securities | 6,021,983 | 5,791,676
FHLB funding agreements | 644,500 | 545,000
FHLB of Chicago |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities | 701,900 | 594,200
Governmental Agencies as Required by Law in Various States |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities | $ 26,900 | $ 26,000

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