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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | $ 6,345,290 | $ 5,791,676
Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 684,838 | 724,319
Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 433,153 | 458,868
Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,827,497 | 1,686,203
Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 45,053 | 45,370
Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 2,122,899 | 1,581,424
Other asset-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,231,850 | 1,295,492
Level 3 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 11,074 |
Level 3 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 59,590 |
Level 3 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 155,816 |
Level 3 | Other asset-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 128,283 |
Carrying Value |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 6,644,971 | 6,092,204
Separate account (variable annuity) assets | 2,891,423 | 2,490,469
Investment contract and life policy reserves, embedded derivatives | 2,474 | 1,314
Other policyholder funds, embedded derivatives | 104,488 | 93,733
Carrying Value | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 141,770 | 172,667
Carrying Value | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 6,345,290 | 5,791,676
Carrying Value | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 684,838 | 724,319
Carrying Value | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 433,153 | 458,868
Carrying Value | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,827,497 | 1,686,203
Carrying Value | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 45,054 | 45,370
Carrying Value | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 2,122,898 | 1,581,424
Carrying Value | Other asset-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,231,850 | 1,295,492
Carrying Value | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 121,653 | 101,864
Carrying Value | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 36,258 | 25,997
Fair Value |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 6,644,971 | 6,092,204
Separate account (variable annuity) assets | 2,891,423 | 2,490,469
Investment contract and life policy reserves, embedded derivatives | 2,474 | 1,314
Other policyholder funds, embedded derivatives | 104,488 | 93,733
Fair Value | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 141,770 | 172,667
Fair Value | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 6,345,290 | 5,791,676
Fair Value | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 684,838 | 724,319
Fair Value | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 433,153 | 458,868
Fair Value | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,827,497 | 1,686,203
Fair Value | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 45,054 | 45,370
Fair Value | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 2,122,898 | 1,581,424
Fair Value | Other asset-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,231,850 | 1,295,492
Fair Value | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 121,653 | 101,864
Fair Value | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 36,258 | 25,997
Fair Value | Level 1 |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 210,140 | 254,670
Separate account (variable annuity) assets | 2,891,423 | 2,490,469
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 1 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 137,679 | 172,667
Fair Value | Level 1 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 33,226 | 32,169
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 | 18,350 | 17,699
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 | 14,876 | 14,470
Fair Value | Level 1 | Other asset-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 | 39,235 | 49,834
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 | 6,079,765 | 5,542,356
Separate account (variable annuity) assets | 0 | 0
Investment contract and life policy reserves, embedded derivatives | 2,474 | 1,314
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 2 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 4,091 | 0
Fair Value | Level 2 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 5,957,301 | 5,464,436
Fair Value | Level 2 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 673,764 | 711,004
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 414,803 | 441,169
Fair Value | Level 2 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,767,907 | 1,641,912
Fair Value | Level 2 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 45,054 | 45,370
Fair Value | Level 2 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,952,206 | 1,463,002
Fair Value | Level 2 | Other asset-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,103,567 | 1,161,979
Fair Value | Level 2 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 82,115 | 51,923
Fair Value | Level 2 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 36,258 | 25,997
Fair Value | Level 3 |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 355,066 | 295,178
Separate account (variable annuity) assets | 0 | 0
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 104,488 | 93,733
Fair Value | Level 3 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Fair Value | Level 3 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 354,763 | 295,071
Fair Value | Level 3 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 11,074 | 13,315
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 | 59,590 | 44,291
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 | 155,816 | 103,952
Fair Value | Level 3 | Other asset-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 128,283 | 133,513
Fair Value | Level 3 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 303 | 107
Fair Value | Level 3 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | $ 0 | $ 0

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