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Derivative Instruments (Details 7) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | $ 254,136,000 | $ (36,056,000) | $ 212,030,000
Policy Acquisition Costs And Other Insurance Expenses | 1,306,470,000 | 990,021,000 | 1,137,589,000
Interest credited | 379,915,000 | 316,394,000 | 309,982,000
Interest Rate Swap [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | 16,028,000 | 178,338,000 | 68,736,000
Future [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (20,245,000) | (945,000) | (44,959,000)
Foreign Exchange Forward [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (5,644,000) | 1,675,000 | 3,387,000
Consumer Price Index Swap [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (267,000) | 1,821,000 | 962,000
Credit Default Swap [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | 18,359,000 | (63,000) | 4,786,000
Equity [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | (69,677,000) | 7,818,000 | (3,006,000)
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | 115,009,000 | (87,236,000) | 160,274,000
Embedded Derivatives In Indexed Annuity [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Policy Acquisition Costs And Other Insurance Expenses | (630,000) | (24,551,000) | 6,457,000
Interest credited | (29,804,000) | (90,370,000) | (51,445,000)
Embedded Derivatives In Variable Annuity [Member] |  |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |  |
Total investment related gains (losses), net | $ 104,613,000 | $ (224,184,000) | $ (28,786,000)

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- Definition Policy Acquisition Costs And Other Insurance Expenses + References No definition available. + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 7 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 + Details
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- Definition Interest allocated to policyholders holding contracts under which the insurer must provide a guaranteed yield. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.6) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 6 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 97 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6480726&loc=d3e6691-158385 + Details
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