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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Assets |  |
Fixed maturity securities | $ 6,021,983,000 | $ 5,791,676,000
Equity securities | 90,338,000 | 101,864,000
Mortgage-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 718,974,000 | 724,319,000
Other, including U.S. Treasury securities |  |
Financial Assets |  |
Fixed maturity securities | 374,881,000 | 458,868,000
Municipal bonds |  |
Financial Assets |  |
Fixed maturity securities | 1,805,550,000 | 1,686,203,000
Foreign government bonds |  |
Financial Assets |  |
Fixed maturity securities | 43,550,000 | 45,370,000
Corporate bonds |  |
Financial Assets |  |
Fixed maturity securities | 1,862,440,000 | 1,581,424,000
Other asset-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 1,216,588,000 | 1,295,492,000
Level 3 |  |
Financial Assets |  |
Equity securities | 115,000 |
Financial Liabilities |  |
Other policyholder funds, embedded derivatives | 93,619,000 |
Level 3 | Mortgage-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 24,461,000 |
Level 3 | Municipal bonds |  |
Financial Assets |  |
Fixed maturity securities | 73,171,000 |
Level 3 | Corporate bonds |  |
Financial Assets |  |
Fixed maturity securities | 126,292,000 |
Level 3 | Other asset-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 175,685,000 |
Carrying Amount |  |
Financial Assets |  |
Equity securities | 90,338,000 | 101,864,000
Short-term investments | 182,670,000 | 172,667,000
Other investments | 23,604,000 | 25,997,000
Totals | 6,318,595,000 | 6,092,204,000
Separate Account (variable annuity) assets (1) | 2,316,900,000 | 2,490,469,000
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 1,113,000 | 1,314,000
Other policyholder funds, embedded derivatives | 93,619,000 | 93,733,000
Carrying Amount | Recurring |  |
Financial Assets |  |
Fixed maturity securities | 6,021,983,000 | 5,791,676,000
Carrying Amount | Mortgage-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 718,974,000 | 724,319,000
Carrying Amount | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Fixed maturity securities | 374,881,000 | 458,868,000
Carrying Amount | Municipal bonds |  |
Financial Assets |  |
Fixed maturity securities | 1,805,550,000 | 1,686,203,000
Carrying Amount | Foreign government bonds |  |
Financial Assets |  |
Fixed maturity securities | 43,550,000 | 45,370,000
Carrying Amount | Corporate bonds |  |
Financial Assets |  |
Fixed maturity securities | 1,862,440,000 | 1,581,424,000
Carrying Amount | Other asset-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 1,216,588,000 | 1,295,492,000
Fair Value |  |
Financial Assets |  |
Equity securities | 90,338,000 | 101,864,000
Short-term investments | 182,670,000 | 172,667,000
Other investments | 23,604,000 | 25,997,000
Totals | 6,318,595,000 | 6,092,204,000
Separate Account (variable annuity) assets (1) | 2,316,900,000 | 2,490,469,000
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 1,113,000 | 1,314,000
Other policyholder funds, embedded derivatives | 93,619,000 | 93,733,000
Fair Value | Recurring |  |
Financial Assets |  |
Fixed maturity securities | 6,021,983,000 | 5,791,676,000
Fair Value | Mortgage-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 718,974,000 | 724,319,000
Fair Value | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Fixed maturity securities | 374,881,000 | 458,868,000
Fair Value | Municipal bonds |  |
Financial Assets |  |
Fixed maturity securities | 1,805,550,000 | 1,686,203,000
Fair Value | Foreign government bonds |  |
Financial Assets |  |
Fixed maturity securities | 43,550,000 | 45,370,000
Fair Value | Corporate bonds |  |
Financial Assets |  |
Fixed maturity securities | 1,862,440,000 | 1,581,424,000
Fair Value | Other asset-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 1,216,588,000 | 1,295,492,000
Fair Value | Level 1 |  |
Financial Assets |  |
Equity securities | 35,269,000 | 49,834,000
Short-term investments | 179,651,000 | 172,667,000
Other investments | 0 | 0
Totals | 246,213,000 | 254,670,000
Separate Account (variable annuity) assets (1) | 2,316,900,000 | 2,490,469,000
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 |  |
Fixed maturity securities | 31,293,000 | 32,169,000
Fair Value | Level 1 | Mortgage-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 0 | 0
Fair Value | Level 1 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Fixed maturity securities | 18,520,000 | 17,699,000
Fair Value | Level 1 | Municipal bonds |  |
Financial Assets |  |
Fixed maturity securities | 0 | 0
Fair Value | Level 1 | Foreign government bonds |  |
Financial Assets |  |
Fixed maturity securities | 0 | 0
Fair Value | Level 1 | Corporate bonds |  |
Financial Assets |  |
Fixed maturity securities | 12,773,000 | 14,470,000
Fair Value | Level 1 | Other asset-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 0 | 0
Fair Value | Level 2 |  |
Financial Assets |  |
Equity securities | 54,954,000 | 51,923,000
Short-term investments | 3,019,000 | 0
Other investments | 23,604,000 | 25,997,000
Totals | 5,672,658,000 | 5,542,356,000
Separate Account (variable annuity) assets (1) | 0 | 0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 1,113,000 | 1,314,000
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 2 | Recurring |  |
Financial Assets |  |
Fixed maturity securities | 5,591,081,000 | 5,464,436,000
Fair Value | Level 2 | Mortgage-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 694,513,000 | 711,004,000
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Fixed maturity securities | 356,361,000 | 441,169,000
Fair Value | Level 2 | Municipal bonds |  |
Financial Assets |  |
Fixed maturity securities | 1,732,379,000 | 1,641,912,000
Fair Value | Level 2 | Foreign government bonds |  |
Financial Assets |  |
Fixed maturity securities | 43,550,000 | 45,370,000
Fair Value | Level 2 | Corporate bonds |  |
Financial Assets |  |
Fixed maturity securities | 1,723,375,000 | 1,463,002,000
Fair Value | Level 2 | Other asset-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 1,040,903,000 | 1,161,979,000
Fair Value | Level 3 |  |
Financial Assets |  |
Equity securities | 115,000 | 107,000
Short-term investments | 0 | 0
Other investments | 0 | 0
Totals | 399,724,000 | 295,178,000
Separate Account (variable annuity) assets (1) | 0 | 0
Financial Liabilities |  |
Investment contract and policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 93,619,000 | 93,733,000
Fair Value | Level 3 | Recurring |  |
Financial Assets |  |
Fixed maturity securities | 399,609,000 | 295,071,000
Fair Value | Level 3 | Mortgage-backed securities |  |
Financial Assets |  |
Fixed maturity securities | 24,461,000 | 13,315,000
Fair Value | Level 3 | Other, including U.S. Treasury securities |  |
Financial Assets |  |
Fixed maturity securities | 0 | 0
Fair Value | Level 3 | Municipal bonds |  |
Financial Assets |  |
Fixed maturity securities | 73,171,000 | 44,291,000
Fair Value | Level 3 | Foreign government bonds |  |
Financial Assets |  |
Fixed maturity securities | 0 | 0
Fair Value | Level 3 | Corporate bonds |  |
Financial Assets |  |
Fixed maturity securities | 126,292,000 | 103,952,000
Fair Value | Level 3 | Other asset-backed securities |  |
Financial Assets |  |
Fixed maturity securities | $ 175,685,000 | $ 133,513,000

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