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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | $ 7,663,469 | $ 7,379,290
Fair Value | 7,663,469 | 7,379,290
Investment contract and life policy reserves, embedded derivatives, Carrying Amount | 158 | 14
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 158 | 14
Other policyholder funds, embedded derivatives, Carrying Amount | 59,393 | 39,021
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 59,393 | 39,021
Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 7,456,708 | 7,091,340
Fair Value | 7,456,708 | 7,091,340
Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 44,918 | 174,152
Fair Value | 44,918 | 174,152
Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 442,419 | 504,414
Fair Value | 442,419 | 504,414
Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 467,143 | 546,111
Fair Value | 467,143 | 546,111
Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,769,397 | 1,708,943
Fair Value | 1,769,397 | 1,708,943
Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 98,669 | 73,617
Fair Value | 98,669 | 73,617
Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 2,810,221 | 2,779,415
Fair Value | 2,810,221 | 2,779,415
Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,868,859 | 1,478,840
Fair Value | 1,868,859 | 1,478,840
Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 141,649 | 99,797
Fair Value | 141,649 | 99,797
Other Investment [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 20,194 | 14,001
Fair Value | 20,194 | 14,001
Level 1 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 169,962 | 280,305
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 | 27,163 | 24,453
Level 1 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 44,167 | 169,764
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 | 13,631 | 14,258
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 | 13,532 | 10,195
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 | 98,632 | 86,088
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 | 7,281,403 | 6,925,559
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 158 | 14
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 | 7,218,198 | 6,893,467
Level 2 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 4,388
Level 2 [Member] | Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 439,004 | 504,414
Level 2 [Member] | Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 453,512 | 531,853
Level 2 [Member] | Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,722,900 | 1,678,564
Level 2 [Member] | Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 98,669 | 73,617
Level 2 [Member] | Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 2,736,498 | 2,701,645
Level 2 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,767,615 | 1,403,374
Level 2 [Member] | Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 43,011 | 13,703
Level 2 [Member] | Other Investment [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 20,194 | 14,001
Level 3 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 212,104 | 173,426
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 0 | 0
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 59,393 | 39,021
Level 3 [Member] | Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 211,347 | 173,420
Level 3 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 751 | 0
Level 3 [Member] | Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 3,415 | 0
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 | 46,497 | 30,379
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 | 60,191 | 67,575
Level 3 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 101,244 | 75,466
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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