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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Amount |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | $ 7,765,437 | $ 7,950,184
Investment contract and life policy reserves, embedded derivatives | 248 | 594
Other policyholder funds, embedded derivatives | 78,700 | 80,733
Carrying Amount | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,515,318 | 7,724,075
Carrying Amount | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 122,222 | 62,593
Carrying Amount | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 787,441 | 696,725
Carrying Amount | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 833,542 | 735,408
Carrying Amount | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,003,969 | 1,893,253
Carrying Amount | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 84,904 | 102,738
Carrying Amount | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,079,510 | 2,578,954
Carrying Amount | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,725,952 | 1,716,997
Carrying Amount | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 111,750 | 135,466
Carrying Amount | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 16,147 | 28,050
Fair Value |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,765,437 | 7,950,184
Investment contract and life policy reserves, embedded derivatives | 248 | 594
Other policyholder funds, embedded derivatives | 78,700 | 80,733
Fair Value | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,515,318 | 7,724,075
Fair Value | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 122,222 | 62,593
Fair Value | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 787,441 | 696,725
Fair Value | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 833,542 | 735,408
Fair Value | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,003,969 | 1,893,253
Fair Value | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 84,904 | 102,738
Fair Value | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,079,510 | 2,578,954
Fair Value | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,725,952 | 1,716,997
Fair Value | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 111,750 | 135,466
Fair Value | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 16,147 | 28,050
Fair Value | Level 1 |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 207,198 | 172,539
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: |  |
Investments | 25,572 | 27,738
Fair Value | Level 1 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 117,296 | 62,593
Fair Value | Level 1 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 1 | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 13,291 | 13,393
Fair Value | Level 1 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 1 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 1 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 12,281 | 14,345
Fair Value | Level 1 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 1 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 64,330 | 82,208
Fair Value | Level 1 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 2 |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,309,750 | 7,547,388
Investment contract and life policy reserves, embedded derivatives | 248 | 594
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 2 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,241,262 | 7,466,086
Fair Value | Level 2 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 4,926 | 0
Fair Value | Level 2 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 784,224 | 693,375
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 820,251 | 722,015
Fair Value | Level 2 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,956,438 | 1,843,925
Fair Value | Level 2 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 84,904 | 102,738
Fair Value | Level 2 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,986,487 | 2,491,630
Fair Value | Level 2 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,608,958 | 1,612,403
Fair Value | Level 2 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 47,415 | 53,252
Fair Value | Level 2 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 16,147 | 28,050
Fair Value | Level 3 |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 248,489 | 230,257
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 78,700 | 80,733
Fair Value | Level 3 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 248,484 | 230,251
Fair Value | Level 3 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 3 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 3,217 | 3,350
Fair Value | Level 3 | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 3 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 47,531 | 49,328
Fair Value | Level 3 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 3 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 80,742 | 72,979
Fair Value | Level 3 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 116,994 | 104,594
Fair Value | Level 3 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 5 | 6
Fair Value | Level 3 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | $ 0 | $ 0

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