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Investments Schedule of Components of Net Investment Income (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Net Investment Income, Insurance Entity, Fixed Maturities | $ 1,112,296,000 | $ 1,048,376,000 | $ 875,894,000
Net Investment Income, Insurance Entity, Equity Securities | 3,090,000 | 3,315,000 | 5,299,000
Net Investment Income, Insurance Entity, Mortgage Loans on Real Estate | 176,354,000 | 172,731,000 | 159,193,000
Net Investment Income, Isurance Entity, Cash and Cash Equivalents | 2,243,000 | 554,000 | 621,000
Net Investment Income, Insurance Entity, Other Long-term Investments | 6,348,000 | 4,020,000 | 1,636,000
Net Investment Income, Insurance Entity, Gross | 1,300,331,000 | 1,228,996,000 | 1,042,643,000
Net Investment Income, Insurance Entity, Investment Expenses | (13,408,000) | (10,216,000) | (6,537,000)
Net Investment Income, Insurance Entity | 1,286,923,000 | 1,218,780,000 | 1,036,106,000
Proceeds from Sale, Maturity and Collection of Investments [Abstract] |  |  |
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities | 3,298,623,000 | 3,705,605,000 | 4,568,499,000
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities | 2,618,207,000 | 219,372,000 | 1,585,267,000
Fixed Maturities [Member] |  |  |
Proceeds from Sale, Maturity and Collection of Investments [Abstract] |  |  |
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities | 2,800,000,000 | 3,400,000,000 | 4,100,000,000
Proceeds from Sale of Available-for-sale Securities | $ 492,500,000 | $ 252,200,000 | $ 340,600,000

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- Definition The total amount of investment earnings, excluding realized and unrealized gain (loss), recognized in the period on the entity's investments, before deduction of related investment expenses. Such amount includes interest, dividends, and rental income. + References No definition available. + Details
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- Definition Total expenses related to the generation of investment income in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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