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Schedule I - Summary of Investments - Other Than Investments in Related Parties Level 4 (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | $ 27,537,210
Summary of Investments, Other than Investments in Related Parties, Cost | 25,094,125
Mortgage Loans on Real Estate [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 2,623,940
Summary of Investments, Other than Investments in Related Parties, Cost | 2,623,940
Summary of Investments, Other than Investments in Related Parties, Fair Value | 2,848,235
Derivative Financial Instruments, Assets [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 415,258
Summary of Investments, Other than Investments in Related Parties, Cost | 196,106
Summary of Investments, Other than Investments in Related Parties, Fair Value | 415,258
Other Long-term Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 196,366
Summary of Investments, Other than Investments in Related Parties, Cost | 196,366
Fixed Maturities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 24,248,224
Summary of Investments, Other than Investments in Related Parties, Cost | 22,033,115
Summary of Investments, Other than Investments in Related Parties, Fair Value | 24,233,657
Fixed Maturities [Member] | Available-for-sale Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 24,172,136
Summary of Investments, Other than Investments in Related Parties, Cost | 21,957,027
Summary of Investments, Other than Investments in Related Parties, Fair Value | 24,172,136
Equity Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 53,422
Summary of Investments, Other than Investments in Related Parties, Cost | 44,598
Summary of Investments, Other than Investments in Related Parties, Fair Value | 53,422
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 30,120
Summary of Investments, Other than Investments in Related Parties, Cost | 29,955
Summary of Investments, Other than Investments in Related Parties, Fair Value | 30,120
Equity Securities [Member] | Banks, Trust and Insurance, Equities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 23,302
Summary of Investments, Other than Investments in Related Parties, Cost | 14,643
Summary of Investments, Other than Investments in Related Parties, Fair Value | 23,302
Available-for-sale Securities [Member] | Fixed Maturities [Member] | US Treasury Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 5,154
Summary of Investments, Other than Investments in Related Parties, Cost | 4,590
Summary of Investments, Other than Investments in Related Parties, Fair Value | 5,154
Available-for-sale Securities [Member] | Fixed Maturities [Member] | US Government Agencies Debt Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 1,772,025
Summary of Investments, Other than Investments in Related Parties, Cost | 1,763,789
Summary of Investments, Other than Investments in Related Parties, Fair Value | 1,772,025
Available-for-sale Securities [Member] | Fixed Maturities [Member] | US States and Political Subdivisions Debt Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 3,578,323
Summary of Investments, Other than Investments in Related Parties, Cost | 3,116,678
Summary of Investments, Other than Investments in Related Parties, Fair Value | 3,578,323
Available-for-sale Securities [Member] | Fixed Maturities [Member] | Foreign Government Debt Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 105,259
Summary of Investments, Other than Investments in Related Parties, Cost | 86,099
Summary of Investments, Other than Investments in Related Parties, Fair Value | 105,259
Available-for-sale Securities [Member] | Fixed Maturities [Member] | Corporate Debt Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 14,466,772
Summary of Investments, Other than Investments in Related Parties, Cost | 12,930,173
Summary of Investments, Other than Investments in Related Parties, Fair Value | 14,466,772
Available-for-sale Securities [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 2,888,113
Summary of Investments, Other than Investments in Related Parties, Cost | 2,743,537
Summary of Investments, Other than Investments in Related Parties, Fair Value | 2,888,113
Available-for-sale Securities [Member] | Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 357,982
Summary of Investments, Other than Investments in Related Parties, Cost | 354,870
Summary of Investments, Other than Investments in Related Parties, Fair Value | 357,982
Available-for-sale Securities [Member] | Fixed Maturities [Member] | Asset-backed Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 998,508
Summary of Investments, Other than Investments in Related Parties, Cost | 957,291
Summary of Investments, Other than Investments in Related Parties, Fair Value | 998,508
Held-to-maturity Securities [Member] | Fixed Maturities [Member] | Corporate Debt Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 76,088
Summary of Investments, Other than Investments in Related Parties, Cost | 76,088
Summary of Investments, Other than Investments in Related Parties, Fair Value | $ 61,521

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- Definition This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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- Definition This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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- Definition This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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