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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | $ 7,774,028 | $ 7,379,290
Fair Value | 7,774,028 | 7,379,290
Investment contract and life policy reserves, embedded derivatives, Carrying Amount | 50 | 14
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 50 | 14
Other policyholder funds, embedded derivatives, Carrying Amount | 47,706 | 39,021
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 47,706 | 39,021
Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 7,481,712 | 7,091,340
Fair Value | 7,481,712 | 7,091,340
Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 153,328 | 174,152
Fair Value | 153,328 | 174,152
Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 510,304 | 504,414
Fair Value | 510,304 | 504,414
Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 548,512 | 546,111
Fair Value | 548,512 | 546,111
Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,745,764 | 1,708,943
Fair Value | 1,745,764 | 1,708,943
Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 79,094 | 73,617
Fair Value | 79,094 | 73,617
Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 2,887,186 | 2,779,415
Fair Value | 2,887,186 | 2,779,415
Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,710,852 | 1,478,840
Fair Value | 1,710,852 | 1,478,840
Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 123,163 | 99,797
Fair Value | 123,163 | 99,797
Other investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 15,825 | 14,001
Fair Value | 15,825 | 14,001
Level 1 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 285,027 | 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 | 22,858 | 24,453
Level 1 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 152,830 | 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 | 13,985 | 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 | 8,873 | 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 | 109,339 | 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 | 7,271,359 | 6,925,559
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 50 | 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 | 7,241,218 | 6,893,467
Level 2 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 498 | 4,388
Level 2 [Member] | Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 506,474 | 504,414
Level 2 [Member] | Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 534,527 | 531,853
Level 2 [Member] | Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,698,117 | 1,678,564
Level 2 [Member] | Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 79,094 | 73,617
Level 2 [Member] | Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 2,804,905 | 2,701,645
Level 2 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,618,101 | 1,403,374
Level 2 [Member] | Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 13,818 | 13,703
Level 2 [Member] | Other investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 15,825 | 14,001
Level 3 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 217,642 | 173,426
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 0 | 0
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 47,706 | 39,021
Level 3 [Member] | Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 217,636 | 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 | 3,830 | 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 | 47,647 | 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 | 73,408 | 67,575
Level 3 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 92,751 | 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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