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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | $ 5,791,676 | $ 7,515,318
Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 724,319 | 787,441
Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 458,868 | 833,542
Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,686,203 | 2,003,969
Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 45,370 | 84,904
Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,581,424 | 2,079,510
Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,295,492 | 1,725,952
Carrying Amount |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 6,092,204 | 7,765,437
Separate Account (variable annuity) assets | 2,490,469 | 2,001,128
Investment contract and life policy reserves, embedded derivatives | 1,314 | 248
Other policyholder funds, embedded derivatives | 93,733 | 78,700
Carrying Amount | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 5,791,676 | 7,515,318
Carrying Amount | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 172,667 | 122,222
Carrying Amount | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 724,319 | 787,441
Carrying Amount | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 458,868 | 833,542
Carrying Amount | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,686,203 | 2,003,969
Carrying Amount | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 45,370 | 84,904
Carrying Amount | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,581,424 | 2,079,510
Carrying Amount | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,295,492 | 1,725,952
Carrying Amount | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 101,864 | 111,750
Carrying Amount | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 25,997 | 16,147
Fair Value |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 6,092,204 | 7,765,437
Separate Account (variable annuity) assets | 2,490,469 | 2,001,128
Investment contract and life policy reserves, embedded derivatives | 1,314 | 248
Other policyholder funds, embedded derivatives | 93,733 | 78,700
Fair Value | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 5,791,676 | 7,515,318
Fair Value | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 172,667 | 122,222
Fair Value | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 724,319 | 787,441
Fair Value | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 458,868 | 833,542
Fair Value | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,686,203 | 2,003,969
Fair Value | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 45,370 | 84,904
Fair Value | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,581,424 | 2,079,510
Fair Value | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,295,492 | 1,725,952
Fair Value | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 101,864 | 111,750
Fair Value | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 25,997 | 16,147
Fair Value | Level 1 |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 254,670 | 207,198
Separate Account (variable annuity) assets | 2,490,469 | 2,001,128
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 1 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 32,169 | 25,572
Fair Value | Level 1 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 172,667 | 117,296
Fair Value | Level 1 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Fair Value | Level 1 | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 17,699 | 13,291
Fair Value | Level 1 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Fair Value | Level 1 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Fair Value | Level 1 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 14,470 | 12,281
Fair Value | Level 1 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Fair Value | Level 1 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 49,834 | 64,330
Fair Value | Level 1 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Fair Value | Level 2 |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 5,542,356 | 7,309,750
Separate Account (variable annuity) assets | 0 | 0
Investment contract and life policy reserves, embedded derivatives | 1,314 | 248
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 2 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 5,464,436 | 7,241,262
Fair Value | Level 2 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 4,926
Fair Value | Level 2 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 711,004 | 784,224
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 441,169 | 820,251
Fair Value | Level 2 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,641,912 | 1,956,438
Fair Value | Level 2 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 45,370 | 84,904
Fair Value | Level 2 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,463,002 | 1,986,487
Fair Value | Level 2 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,161,979 | 1,608,958
Fair Value | Level 2 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 51,923 | 47,415
Fair Value | Level 2 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 25,997 | 16,147
Fair Value | Level 3 |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 295,178 | 248,489
Separate Account (variable annuity) assets | 0 | 0
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 93,733 | 78,700
Fair Value | Level 3 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 295,071 | 248,484
Fair Value | Level 3 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Fair Value | Level 3 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 13,315 | 3,217
Fair Value | Level 3 | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Fair Value | Level 3 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 44,291 | 47,531
Fair Value | Level 3 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Fair Value | Level 3 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 103,952 | 80,742
Fair Value | Level 3 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 133,513 | 116,994
Fair Value | Level 3 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 107 | 5
Fair Value | Level 3 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | $ 0 | $ 0

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