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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financial Assets |  |  |
Debt securities, available-for-sale | $ 6,168,558 |  | $ 5,791,676
Equity securities | 102,303 |  | 101,864
Mortgage-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 702,862 |  | 724,319
Other, including U.S. Treasury securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 384,137 |  | 458,868
Municipal bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,816,501 |  | 1,686,203
Foreign government bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 44,787 |  | 45,370
Corporate bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,983,483 |  | 1,581,424
Other asset-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,236,788 |  | 1,295,492
Level 3 |  |  |
Financial Assets |  |  |
Equity securities |  | $ 88 |
Level 3 | Mortgage-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale |  | 12,199 |
Level 3 | Municipal bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale |  | 65,671 |
Level 3 | Corporate bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale |  | 121,185 |
Level 3 | Other asset-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale |  | $ 128,599 |
Carrying Amount |  |  |
Financial Assets |  |  |
Equity securities | 102,303 |  | 101,864
Short-term investments | 254,309 |  | 172,667
Other investments | 30,245 |  | 25,997
Totals | 6,555,415 |  | 6,092,204
Separate Account (variable annuity) assets | 2,488,528 |  | 2,490,469
Financial Liabilities |  |  |
Investment contract and policy reserves, embedded derivatives | 1,703 |  | 1,314
Other policyholder funds, embedded derivatives | 98,070 |  | 93,733
Carrying Amount | Recurring |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 6,168,558 |  | 5,791,676
Carrying Amount | Mortgage-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 702,862 |  | 724,319
Carrying Amount | Other, including U.S. Treasury securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 384,137 |  | 458,868
Carrying Amount | Municipal bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,816,501 |  | 1,686,203
Carrying Amount | Foreign government bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 44,787 |  | 45,370
Carrying Amount | Corporate bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,983,483 |  | 1,581,424
Carrying Amount | Other asset-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,236,788 |  | 1,295,492
Fair Value |  |  |
Financial Assets |  |  |
Equity securities | 102,303 |  | 101,864
Short-term investments | 254,309 |  | 172,667
Other investments | 30,245 |  | 25,997
Totals | 6,555,415 |  | 6,092,204
Separate Account (variable annuity) assets | 2,488,528 |  | 2,490,469
Financial Liabilities |  |  |
Investment contract and policy reserves, embedded derivatives | 1,703 |  | 1,314
Other policyholder funds, embedded derivatives | 98,070 |  | 93,733
Fair Value | Recurring |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 6,168,558 |  | 5,791,676
Fair Value | Mortgage-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 702,862 |  | 724,319
Fair Value | Other, including U.S. Treasury securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 384,137 |  | 458,868
Fair Value | Municipal bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,816,501 |  | 1,686,203
Fair Value | Foreign government bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 44,787 |  | 45,370
Fair Value | Corporate bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,983,483 |  | 1,581,424
Fair Value | Other asset-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,236,788 |  | 1,295,492
Fair Value | Level 1 |  |  |
Financial Assets |  |  |
Equity securities | 36,274 |  | 49,834
Short-term investments | 250,206 |  | 172,667
Other investments | 0 |  | 0
Totals | 319,002 |  | 254,670
Separate Account (variable annuity) assets | 2,488,528 |  | 2,490,469
Financial Liabilities |  |  |
Investment contract and policy reserves, embedded derivatives | 0 |  | 0
Other policyholder funds, embedded derivatives | 0 |  | 0
Fair Value | Level 1 | Recurring |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 32,522 |  | 32,169
Fair Value | Level 1 | Mortgage-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 0 |  | 0
Fair Value | Level 1 | Other, including U.S. Treasury securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 18,446 |  | 17,699
Fair Value | Level 1 | Municipal bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 0 |  | 0
Fair Value | Level 1 | Foreign government bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 0 |  | 0
Fair Value | Level 1 | Corporate bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 14,076 |  | 14,470
Fair Value | Level 1 | Other asset-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 0 |  | 0
Fair Value | Level 2 |  |  |
Financial Assets |  |  |
Equity securities | 65,941 |  | 51,923
Short-term investments | 4,103 |  | 0
Other investments | 30,245 |  | 25,997
Totals | 5,908,671 |  | 5,542,356
Separate Account (variable annuity) assets | 0 |  | 0
Financial Liabilities |  |  |
Investment contract and policy reserves, embedded derivatives | 1,703 |  | 1,314
Other policyholder funds, embedded derivatives | 0 |  | 0
Fair Value | Level 2 | Recurring |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 5,808,382 |  | 5,464,436
Fair Value | Level 2 | Mortgage-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 690,663 |  | 711,004
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 365,691 |  | 441,169
Fair Value | Level 2 | Municipal bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,750,830 |  | 1,641,912
Fair Value | Level 2 | Foreign government bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 44,787 |  | 45,370
Fair Value | Level 2 | Corporate bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,848,222 |  | 1,463,002
Fair Value | Level 2 | Other asset-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 1,108,189 |  | 1,161,979
Fair Value | Level 3 |  |  |
Financial Assets |  |  |
Equity securities | 88 |  | 107
Short-term investments | 0 |  | 0
Other investments | 0 |  | 0
Totals | 327,742 |  | 295,178
Separate Account (variable annuity) assets | 0 |  | 0
Financial Liabilities |  |  |
Investment contract and policy reserves, embedded derivatives | 0 |  | 0
Other policyholder funds, embedded derivatives | 98,070 |  | 93,733
Fair Value | Level 3 | Recurring |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 327,654 |  | 295,071
Fair Value | Level 3 | Mortgage-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 12,199 |  | 13,315
Fair Value | Level 3 | Other, including U.S. Treasury securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 0 |  | 0
Fair Value | Level 3 | Municipal bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 65,671 |  | 44,291
Fair Value | Level 3 | Foreign government bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 0 |  | 0
Fair Value | Level 3 | Corporate bonds |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | 121,185 |  | 103,952
Fair Value | Level 3 | Other asset-backed securities |  |  |
Financial Assets |  |  |
Debt securities, available-for-sale | $ 128,599 |  | $ 133,513

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