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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
U.S. government and federally sponsored agency obligations: |  |
Investments, Carrying Amount | $ 6,426,099 | $ 6,292,097
Separate Account (variable annuity) assets | 1,508,260 | 1,398,281
Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Carrying Amount | 6,143,673 | 5,962,232
Fair Value | 6,143,673 | 5,962,232
Investments, Carrying Amount | 6,236,809 | 6,103,296
Investments, Fair Value | 6,236,809 | 6,103,296
Separate Account (variable annuity) assets | 1,508,260 | 1,398,281
Separate Account (variable annuity) assets, Fair Value | 1,508,260 | 1,398,281
Financial Liabilities |  |
Short-term investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Investments, Carrying Amount | 34,475 | 87,561
Investments, Fair Value | 34,475 | 87,561
Mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Carrying Amount | 631,424 | 619,559
Fair Value | 631,424 | 619,559
Other, including U.S. Treasury Securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Carrying Amount | 448,519 | 409,428
Fair Value | 448,519 | 409,428
Municipal bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Carrying Amount | 1,604,242 | 1,586,037
Fair Value | 1,604,242 | 1,586,037
Foreign government bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Carrying Amount | 59,343 | 57,869
Fair Value | 59,343 | 57,869
Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Carrying Amount | 2,649,520 | 2,567,034
Fair Value | 2,649,520 | 2,567,034
Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Carrying Amount | 750,625 | 722,305
Fair Value | 750,625 | 722,305
Equity securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Carrying Amount | 58,661 | 53,503
Fair Value | 58,661 | 53,503
Level 1 [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 32,022 | 30,528
Investments, Fair Value | 114,257 | 161,793
Separate Account (variable annuity) assets, Fair Value | 1,508,260 |
Financial Liabilities |  |
Level 1 [Member] | Short-term investments [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Investments, Fair Value | 34,475 | 87,561
Level 1 [Member] | Other, including U.S. Treasury Securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 18,443 | 18,594
Level 1 [Member] | Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 13,579 | 11,934
Level 1 [Member] | Equity securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 47,760 | 43,704
Level 2 [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 6,007,895 | 5,800,535
Investments, Fair Value | 6,018,456 | 5,809,994
Separate Account (variable annuity) assets, Fair Value |  | 1,398,281
Financial Liabilities |  |
Level 2 [Member] | Mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 631,424 | 619,559
Level 2 [Member] | Other, including U.S. Treasury Securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 430,076 | 390,834
Level 2 [Member] | Municipal bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 1,589,096 | 1,573,762
Level 2 [Member] | Foreign government bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 59,343 | 57,869
Level 2 [Member] | Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 2,580,414 | 2,469,378
Level 2 [Member] | Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 717,542 | 689,133
Level 2 [Member] | Equity securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 10,561 | 9,459
Level 3 [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 103,756 | 131,169
Investments, Fair Value | 104,096 | 131,509
Financial Liabilities |  |
Level 3 [Member] | Municipal bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 15,146 | 12,275
Level 3 [Member] | Corporate bonds [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 55,527 | 85,722
Level 3 [Member] | Other mortgage-backed securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | 33,083 | 33,172
Level 3 [Member] | Equity securities [Member] | Recurring [Member] |  |
U.S. government and federally sponsored agency obligations: |  |
Fair Value | $ 340 | $ 340

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