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Schedule I - Summary of Investments - Other Than Investments in Related Parties Level 3 (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Investments, Other than Investments in Related Parties [Abstract] |
Summary of Investment Holdings, Schedule of Investments [Table Text Block] |
Column A |  | Column B |  | Column C |  | Column D
Type of Investment |  | Amortized Cost(1) |  | Fair Value |  | Amount at which shown in the balance sheet
|  | (Dollars in thousands)
Fixed maturity securities: |  |  |  |  |  |
Available for sale: |  |  |  |  |  |
United States Government full faith and credit |  | $ | 4,590 |  |  | $ | 5,154 |  |  | $ | 5,154 |
United States Government sponsored agencies |  | 1,763,789 |  |  | 1,772,025 |  |  | 1,772,025 |
United States municipalities, states and territories |  | 3,116,678 |  |  | 3,578,323 |  |  | 3,578,323 |
Foreign government obligations |  | 86,099 |  |  | 105,259 |  |  | 105,259 |
Corporate securities |  | 12,930,173 |  |  | 14,466,772 |  |  | 14,466,772 |
Residential mortgage backed securities |  | 2,743,537 |  |  | 2,888,113 |  |  | 2,888,113 |
Commercial mortgage backed securities |  | 354,870 |  |  | 357,982 |  |  | 357,982 |
Other asset backed securities |  | 957,291 |  |  | 998,508 |  |  | 998,508 |
|  | 21,957,027 |  |  | 24,172,136 |  |  | 24,172,136 |
Held for investment: |  |  |  |  |  |
Corporate security |  | 76,088 |  |  | 61,521 |  |  | 76,088 |
Total fixed maturity securities |  | 22,033,115 |  |  | $ | 24,233,657 |  |  | 24,248,224 |
Equity securities, available for sale: |  |  |  |  |  |
Non-redeemable preferred stocks |  | 29,955 |  |  | 30,120 |  |  | 30,120 |
Common stocks |  | 14,643 |  |  | 23,302 |  |  | 23,302 |
Total equity securities |  | 44,598 |  |  | 53,422 |  |  | 53,422 |
Mortgage loans on real estate |  | 2,623,940 |  |  | 2,848,235 |  |  | 2,623,940 |
Derivative instruments |  | 196,106 |  |  | 415,258 |  |  | 415,258 |
Other investments |  | 196,366 |  |  |  |  |  | 196,366 |
Total investments |  | $ | 25,094,125 |  |  |  |  |  | $ | 27,537,210 |

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- Definition Tabular disclosure of the information required in the supplementary schedule applicable to management investment companies summarizing the listing of holdings of unaffiliated investments. + References No definition available. + Details
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- Details
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