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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
U.S. government and federally sponsored agency obligations |  |
Investments | $ 5,949,617 | $ 5,677,508
Separate Account (variable annuity) assets | 1,348,077 | 1,273,764
Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 5,694,726 | 5,421,832
Fair Value | 5,694,726 | 5,421,832
Investments | 5,818,522 | 5,549,048
Investments, Fair Value | 5,818,522 | 5,549,048
Separate Account (variable annuity) assets | 1,348,077 | 1,273,764
Separate Account (variable annuity) assets, Fair Value | 1,348,077 | 1,273,764
Short-term investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments | 33,453 | 100,442
Investments, Fair Value | 33,453 | 100,442
Other investments (1) [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments | 131,095 | 128,460
Investments, Fair Value | 135,185 | 132,522
Other investments (1) [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments | 52,308 |
Investments, Fair Value | 52,308 |
Mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 629,530 | 603,812
Fair Value | 629,530 | 603,812
Other [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 488,950 | 603,741
Fair Value | 488,950 | 603,741
Municipal bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 1,509,508 | 1,413,118
Fair Value | 1,509,508 | 1,413,118
Foreign government bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 55,606 | 49,624
Fair Value | 55,606 | 49,624
Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 2,414,465 | 2,156,544
Fair Value | 2,414,465 | 2,156,544
Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 596,667 | 594,993
Fair Value | 596,667 | 594,993
Equity Securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 38,035 | 26,774
Fair Value | 38,035 | 26,774
Level 1 [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 43,634 | 89,930
Investments, Fair Value | 81,757 | 196,895
Level 1 [Member] | Short-term investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value | 33,453 | 97,929
Level 1 [Member] | Other investments (1) [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value |  |
Level 1 [Member] | Other [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 21,616 | 64,444
Level 1 [Member] | Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 22,018 | 25,486
Level 1 [Member] | Equity Securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 4,670 | 9,036
Level 2 [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 5,581,722 | 5,239,114
Investments, Fair Value | 5,614,702 | 5,258,980
Separate Account (variable annuity) assets, Fair Value | 1,348,077 | 1,273,764
Level 2 [Member] | Short-term investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value |  | 2,513
Level 2 [Member] | Other investments (1) [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value |  |
Level 2 [Member] | Mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 629,530 | 603,812
Level 2 [Member] | Other [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 467,334 | 539,297
Level 2 [Member] | Municipal bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 1,509,508 | 1,413,118
Level 2 [Member] | Foreign government bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 55,606 | 49,624
Level 2 [Member] | Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 2,335,988 | 2,042,802
Level 2 [Member] | Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 583,756 | 590,461
Level 2 [Member] | Equity Securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 32,980 | 17,353
Level 3 [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 69,370 | 92,788
Investments, Fair Value | 122,063 | 93,173
Level 3 [Member] | Other investments (1) [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value | 135,185 | 132,522
Level 3 [Member] | Other investments (1) [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value | 52,308 |
Level 3 [Member] | Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 56,459 | 88,256
Level 3 [Member] | Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 12,911 | 4,532
Level 3 [Member] | Equity Securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | $ 385 | $ 385

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