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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Amount |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | $ 7,950,184 | $ 7,663,469
Investment contract and life policy reserves, embedded derivatives | 594 | 158
Other policyholder funds, embedded derivatives | 80,733 | 59,393
Carrying Amount | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,724,075 | 7,456,708
Carrying Amount | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 62,593 | 44,918
Carrying Amount | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 696,725 | 442,419
Carrying Amount | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 735,408 | 467,143
Carrying Amount | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,893,253 | 1,769,397
Carrying Amount | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 102,738 | 98,669
Carrying Amount | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,578,954 | 2,810,221
Carrying Amount | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,716,997 | 1,868,859
Carrying Amount | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 135,466 | 141,649
Carrying Amount | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 28,050 | 20,194
Fair Value |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,950,184 | 7,663,469
Investment contract and life policy reserves, embedded derivatives | 594 | 158
Other policyholder funds, embedded derivatives | 80,733 | 59,393
Fair Value | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,724,075 | 7,456,708
Fair Value | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 62,593 | 44,918
Fair Value | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 696,725 | 442,419
Fair Value | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 735,408 | 467,143
Fair Value | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,893,253 | 1,769,397
Fair Value | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 102,738 | 98,669
Fair Value | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,578,954 | 2,810,221
Fair Value | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,716,997 | 1,868,859
Fair Value | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 135,466 | 141,649
Fair Value | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 28,050 | 20,194
Fair Value | Level 1 |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 172,539 | 169,962
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 | 27,738 | 27,163
Fair Value | Level 1 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 62,593 | 44,167
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 | 13,393 | 13,631
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 | 14,345 | 13,532
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 | 82,208 | 98,632
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 | 7,547,388 | 7,281,403
Investment contract and life policy reserves, embedded derivatives | 594 | 158
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 2 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,466,086 | 7,218,198
Fair Value | Level 2 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 2 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 693,375 | 439,004
Fair Value | Level 2 | Other, including U.S. Treasury securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 722,015 | 453,512
Fair Value | Level 2 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,843,925 | 1,722,900
Fair Value | Level 2 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 102,738 | 98,669
Fair Value | Level 2 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,491,630 | 2,736,498
Fair Value | Level 2 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,612,403 | 1,767,615
Fair Value | Level 2 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 53,252 | 43,011
Fair Value | Level 2 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 28,050 | 20,194
Fair Value | Level 3 |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 230,257 | 212,104
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 80,733 | 59,393
Fair Value | Level 3 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 230,251 | 211,347
Fair Value | Level 3 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 751
Fair Value | Level 3 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 3,350 | 3,415
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 | 49,328 | 46,497
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 | 72,979 | 60,191
Fair Value | Level 3 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 104,594 | 101,244
Fair Value | Level 3 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 6 | 6
Fair Value | Level 3 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | $ 0 | $ 0

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