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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | $ 7,861,933 | $ 7,379,290
Fair Value | 7,861,933 | 7,379,290
Investment contract and life policy reserves, embedded derivatives, Carrying Amount | 80 | 14
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 80 | 14
Other policyholder funds, embedded derivatives, Carrying Amount | 55,179 | 39,021
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 55,179 | 39,021
Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 7,494,053 | 7,091,340
Fair Value | 7,494,053 | 7,091,340
Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 214,206 | 174,152
Fair Value | 214,206 | 174,152
Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 472,156 | 504,414
Fair Value | 472,156 | 504,414
Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 488,127 | 546,111
Fair Value | 488,127 | 546,111
Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,778,741 | 1,708,943
Fair Value | 1,778,741 | 1,708,943
Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 79,839 | 73,617
Fair Value | 79,839 | 73,617
Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 2,953,338 | 2,779,415
Fair Value | 2,953,338 | 2,779,415
Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,721,852 | 1,478,840
Fair Value | 1,721,852 | 1,478,840
Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 137,640 | 99,797
Fair Value | 137,640 | 99,797
Other investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 16,034 | 14,001
Fair Value | 16,034 | 14,001
Level 1 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 345,083 | 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 | 21,235 | 24,453
Level 1 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 213,450 | 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 | 13,894 | 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 | 7,341 | 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 | 110,398 | 86,088
Level 1 [Member] | Other investments [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 | 7,291,908 | 6,925,559
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 80 | 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 | 7,247,882 | 6,893,467
Level 2 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 756 | 4,388
Level 2 [Member] | Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 468,694 | 504,414
Level 2 [Member] | Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 474,233 | 531,853
Level 2 [Member] | Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,733,575 | 1,678,564
Level 2 [Member] | Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 79,839 | 73,617
Level 2 [Member] | Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 2,868,376 | 2,701,645
Level 2 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,623,165 | 1,403,374
Level 2 [Member] | Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 27,236 | 13,703
Level 2 [Member] | Other investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 16,034 | 14,001
Level 3 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 224,942 | 173,426
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 0 | 0
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 55,179 | 39,021
Level 3 [Member] | Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 224,936 | 173,420
Level 3 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 0 | 0
Level 3 [Member] | Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 3,462 | 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 | 45,166 | 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 | 77,621 | 67,575
Level 3 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 98,687 | 75,466
Level 3 [Member] | Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 6 | 6
Level 3 [Member] | Other investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | $ 0 | $ 0

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