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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | $ 7,770,221 | $ 7,663,469
Fair Value | 7,770,221 | 7,663,469
Investment contract and life policy reserves, embedded derivatives, Carrying Amount | 236 | 158
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 236 | 158
Other policyholder funds, embedded derivatives, Carrying Amount | 64,261 | 59,393
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 64,261 | 59,393
Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 7,510,750 | 7,456,708
Fair Value | 7,510,750 | 7,456,708
Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 81,064 | 44,918
Fair Value | 81,064 | 44,918
Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 609,807 | 614,891
Fair Value | 609,807 | 614,891
Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 531,308 | 467,143
Fair Value | 531,308 | 467,143
Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,777,427 | 1,769,397
Fair Value | 1,777,427 | 1,769,397
Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 99,686 | 98,669
Fair Value | 99,686 | 98,669
Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 2,837,173 | 2,810,221
Fair Value | 2,837,173 | 2,810,221
Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,655,349 | 1,696,387
Fair Value | 1,655,349 | 1,696,387
Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 156,975 | 141,649
Fair Value | 156,975 | 141,649
Other Investment [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 21,432 | 20,194
Fair Value | 21,432 | 20,194
Level 1 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 210,224 | 169,962
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 0 | 0
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 0 | 0
Level 1 [Member] | Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 27,792 | 27,163
Level 1 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 79,859 | 44,167
Level 1 [Member] | Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Level 1 [Member] | Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 13,619 | 13,631
Level 1 [Member] | Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Level 1 [Member] | Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Level 1 [Member] | Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 14,173 | 13,532
Level 1 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Level 1 [Member] | Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 102,573 | 98,632
Level 1 [Member] | Other Investment [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Level 2 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 7,311,240 | 7,281,403
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 236 | 158
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 0 | 0
Level 2 [Member] | Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 7,234,207 | 7,218,198
Level 2 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,205 | 0
Level 2 [Member] | Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 605,863 | 611,476
Level 2 [Member] | Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 517,689 | 453,512
Level 2 [Member] | Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,723,965 | 1,722,900
Level 2 [Member] | Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 99,686 | 98,669
Level 2 [Member] | Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 2,740,505 | 2,736,498
Level 2 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,546,499 | 1,595,143
Level 2 [Member] | Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 54,396 | 43,011
Level 2 [Member] | Other Investment [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 21,432 | 20,194
Level 3 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 248,757 | 212,104
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 0 | 0
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 64,261 | 59,393
Level 3 [Member] | Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 248,751 | 211,347
Level 3 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 751
Level 3 [Member] | Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 3,944 | 3,415
Level 3 [Member] | Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Level 3 [Member] | Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 53,462 | 46,497
Level 3 [Member] | Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Level 3 [Member] | Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 82,495 | 60,191
Level 3 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 108,850 | 101,244
Level 3 [Member] | Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 6 | 6
Level 3 [Member] | Other Investment [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | $ 0 | $ 0

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