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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | $ 7,551,390 | $ 7,379,290
Fair Value | 7,551,390 | 7,379,290
Investment contract and life policy reserves, embedded derivatives, Carrying Amount | 23 | 14
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 23 | 14
Other policyholder funds, embedded derivatives, Carrying Amount | 42,085 | 39,021
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 42,085 | 39,021
Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 7,216,502 | 7,091,340
Fair Value | 7,216,502 | 7,091,340
Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 216,204 | 174,152
Fair Value | 216,204 | 174,152
Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 495,200 | 504,414
Fair Value | 495,200 | 504,414
Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 540,120 | 546,111
Fair Value | 540,120 | 546,111
Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,727,328 | 1,708,943
Fair Value | 1,727,328 | 1,708,943
Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 74,087 | 73,617
Fair Value | 74,087 | 73,617
Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 2,833,931 | 2,779,415
Fair Value | 2,833,931 | 2,779,415
Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 1,545,836 | 1,478,840
Fair Value | 1,545,836 | 1,478,840
Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 104,044 | 99,797
Fair Value | 104,044 | 99,797
Other investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Carrying Amount | 14,640 | 14,001
Fair Value | 14,640 | 14,001
Level 1 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 323,215 | 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 | 22,574 | 24,453
Level 1 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 210,320 | 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 | 13,863 | 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 | 8,711 | 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 | 90,321 | 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 | 7,027,784 | 6,925,559
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 23 | 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 | 6,993,543 | 6,893,467
Level 2 [Member] | Short-term investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 5,884 | 4,388
Level 2 [Member] | Mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 493,001 | 504,414
Level 2 [Member] | Other, including U.S. Treasury Securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 526,257 | 531,853
Level 2 [Member] | Municipal bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,680,835 | 1,678,564
Level 2 [Member] | Foreign government bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 74,087 | 73,617
Level 2 [Member] | Corporate bonds [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 2,755,149 | 2,701,645
Level 2 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 1,464,214 | 1,403,374
Level 2 [Member] | Equity securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 13,717 | 13,703
Level 2 [Member] | Other investments [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 14,640 | 14,001
Level 3 [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 200,391 | 173,426
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure | 0 | 0
Other policyholder funds, embedded derivatives, Fair Value Disclosure | 42,085 | 39,021
Level 3 [Member] | Recurring [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 200,385 | 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 | 2,199 | 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 | 46,493 | 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 | 70,071 | 67,575
Level 3 [Member] | Other mortgage-backed securities [Member] |  |
U.S. Government and federally sponsored agency obligations: |  |
Fair Value | 81,622 | 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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