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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Thousands | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, available-for-sale | $ 6,168,558 |  | $ 5,791,676
Equity securities at fair value | 102,303 |  | 101,864
Municipal bonds |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, available-for-sale | 1,816,501 |  | 1,686,203
Corporate bonds |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, available-for-sale | 1,983,483 |  | 1,581,424
Other asset-backed securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, available-for-sale | 1,236,788 |  | 1,295,492
Government mortgage-backed securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, available-for-sale | $ 702,862 |  | $ 724,319
Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Equity securities at fair value |  | $ 88 |
Derivatives embedded in fixed indexed annuity products |  | $ 98,070 |
Level 3 | discounted cash flow | lapse rate | Weighted Average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivatives embedded in fixed indexed annuity products, measurement input |  | 0.0525 |
Level 3 | discounted cash flow | mortality multiplier | Weighted Average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivatives embedded in fixed indexed annuity products, measurement input |  | 0.6100 |
Level 3 | discounted cash flow | option budget | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.0100 |  |
Level 3 | discounted cash flow | option budget | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivatives embedded in fixed indexed annuity products, measurement input | 0.0250 |  |
Level 3 | discounted cash flow | Non-Performance Adjustment | Weighted Average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivatives embedded in fixed indexed annuity products, measurement input |  | 0.0500 |
Level 3 | Black Scholes | equity value | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Equity securities, measurement input | 43.27 |  |
Level 3 | Black Scholes | equity value | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Equity securities, measurement input | 44.53 |  |
Level 3 | Municipal bonds |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, available-for-sale |  | $ 65,671 |
Level 3 | Municipal bonds | discounted cash flow | I Spread | Weighted Average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input | 0.0578 |  |
Level 3 | Corporate bonds |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, available-for-sale |  | 121,185 |
Level 3 | Corporate bonds | discounted cash flow | N Spread | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input | 0.0320 |  |
Level 3 | Corporate bonds | discounted cash flow | N Spread | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input | 0.0818 |  |
Level 3 | Corporate bonds | market comparable | option adjusted spread | Weighted Average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input | 0.1254 |  |
Level 3 | Other asset-backed securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, available-for-sale |  | $ 128,599 |
Level 3 | Other asset-backed securities | discounted cash flow | T spread | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input | 0.0235 |  |
Level 3 | Other asset-backed securities | discounted cash flow | T spread | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input | 0.0800 |  |
Level 3 | Other asset-backed securities | discounted cash flow | constant prepayment rate | Weighted Average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input |  | 0.2000 |
Level 3 | Other asset-backed securities | discounted cash flow | PDI Interest Margin | Weighted Average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input |  | 0.0713 |
Level 3 | Other asset-backed securities | discounted cash flow | SBL Interest Margin | Weighted Average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input |  | 0.0450 |
Level 3 | Other asset-backed securities | vendor price | haircut | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input |  | 0.0300 |
Level 3 | Other asset-backed securities | vendor price | haircut | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input |  | 0.0500 |
Level 3 | Government mortgage-backed securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, available-for-sale |  | $ 12,199 |
Level 3 | Government mortgage-backed securities | vendor price | haircut | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input |  | 0.0300 |
Level 3 | Government mortgage-backed securities | vendor price | haircut | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt securities, measurement input |  | 0.0500 |

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