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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
U.S. government and federally sponsored agency obligations |  |
Investments, Carrying Value | $ 6,174,767 | $ 5,677,508
Separate Account (variable annuity) assets | 1,405,693 | 1,273,764
Financial Liabilities |  |
Financial Liabilities |  |
Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 5,782,052 | 5,421,832
Fair Value | 5,782,052 | 5,421,832
Investments, Carrying Value | 6,041,682 | 5,549,048
Investments, Fair Value | 6,041,682 | 5,549,048
Separate Account (variable annuity) assets | 1,405,693 | 1,273,764
Separate Account (variable annuity) assets, Fair Value | 1,405,693 | 1,273,764
Short-term investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Carrying Value | 167,903 | 100,442
Investments, Fair Value | 167,903 | 100,442
Other investments [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Carrying Value | 133,085 | 128,460
Investments, Fair Value | 137,207 | 132,522
Other investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Carrying Value | 52,516 |
Investments, Fair Value | 52,516 |
Mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 626,897 | 603,812
Fair Value | 626,897 | 603,812
Other [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 463,578 | 603,741
Fair Value | 463,578 | 603,741
Municipal bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 1,559,209 | 1,413,118
Fair Value | 1,559,209 | 1,413,118
Foreign government bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 56,973 | 49,624
Fair Value | 56,973 | 49,624
Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 2,444,175 | 2,156,544
Fair Value | 2,444,175 | 2,156,544
Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 631,220 | 594,993
Fair Value | 631,220 | 594,993
Equity securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Carrying Amount | 39,211 | 26,774
Fair Value | 39,211 | 26,774
Level 1 [Member] |  |
Financial Liabilities |  |
Financial Liabilities |  |
Level 1 [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 38,671 | 89,930
Investments, Fair Value | 232,169 | 196,895
Separate Account (variable annuity) assets, Fair Value | 0 |
Level 1 [Member] | Short-term investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value | 167,903 | 97,929
Level 1 [Member] | Other investments [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value |  |
Level 1 [Member] | Other investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 1 [Member] | Mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 1 [Member] | Other [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 25,841 | 64,444
Level 1 [Member] | Municipal bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 1 [Member] | Foreign government bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 1 [Member] | Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 12,830 | 25,486
Level 1 [Member] | Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 1 [Member] | Equity securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 25,595 | 9,036
Level 2 [Member] |  |
Financial Liabilities |  |
Financial Liabilities |  |
Level 2 [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 5,611,379 | 5,239,114
Investments, Fair Value | 5,624,655 | 5,258,980
Separate Account (variable annuity) assets, Fair Value | 1,405,693 | 1,273,764
Level 2 [Member] | Short-term investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Investments, Fair Value |  | 2,513
Level 2 [Member] | Other investments [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value |  |
Level 2 [Member] | Other investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 2 [Member] | Mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 626,897 | 603,812
Level 2 [Member] | Other [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 437,737 | 539,297
Level 2 [Member] | Municipal bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 1,546,912 | 1,413,118
Level 2 [Member] | Foreign government bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 56,973 | 49,624
Level 2 [Member] | Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 2,345,528 | 2,042,802
Level 2 [Member] | Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 597,332 | 590,461
Level 2 [Member] | Equity securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 13,276 | 17,353
Level 3 [Member] |  |
Financial Liabilities |  |
Financial Liabilities |  |
Level 3 [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 132,002 | 92,788
Investments, Fair Value | 184,858 | 93,173
Separate Account (variable annuity) assets, Fair Value |  |
Level 3 [Member] | Short-term investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 3 [Member] | Other investments [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value | 137,207 | 132,522
Level 3 [Member] | Other investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Investments, Fair Value | 52,516 |
Level 3 [Member] | Mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 3 [Member] | Other [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 3 [Member] | Municipal bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 12,297 |
Level 3 [Member] | Foreign government bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value |  |
Level 3 [Member] | Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 85,817 | 88,256
Level 3 [Member] | Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | 33,888 | 4,532
Level 3 [Member] | Equity securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations |  |
Fair Value | $ 340 | $ 385

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