v2.4.0.6

Investments (Schedule Of Contractual Maturities Of Fixed Maturity Investments) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Investment Holdings [Line Items] |  |
Trading, Amortized Cost, Due in less than one year | $ 405,210 |
Trading, Amortized Cost, Due after one through five years | 2,606,528 |
Trading, Amortized Cost, Due after five through ten years | 625,279 |
Trading, Amortized Cost, Due after ten years | 130,574 |
Trading, Amortized Cost | 4,890,251 |
Trading, Fair Value, Due in less than one year | 405,547 |
Trading, Fair Value, Due after one through five years | 2,615,915 |
Trading, Fair Value, Due after five through ten years | 646,130 |
Trading, Fair Value, Due after ten years | 143,134 |
Trading, Fair Value | 4,948,955 | 4,291,465
Available for Sale, Amortized Cost, Due in less than one year | 112 |
Available for Sale, Amortized Cost, Due after one through five years | 8,358 |
Available for Sale, Amortized Cost, Due after five through ten years | 6,200 |
Available for Sale, Amortized Cost, Due after ten years | 2,145 |
Available for Sale, Amortized Cost | 96,647 | 130,699
Available for Sale, Fair Value, Due in less than one year | 89 |
Available for Sale, Fair Value, Due after one through five years | 8,761 |
Available for Sale, Fair Value, Due after five through ten years | 6,779 |
Available for Sale, Fair Value, Due after ten years | 2,309 |
Available for Sale, Fair Value | 108,102 | 142,052
Debt Securities, Amortized Cost, Due in less than one year | 405,322 |
Debt Securities, Amortized Cost, Due after one through five years | 2,614,886 |
Debt Securities, Amortized Cost, Due after five through ten years | 631,479 |
Debt Securities, Amortized Cost, Due after ten years | 132,719 |
Debt Securities, Amortized Cost | 4,986,898 |
Debt Securities, Fair Value, Due in less than one year | 405,636 |
Debt Securities, Fair Value, Due after one through give years | 2,624,676 |
Debt Securities, Fair Value, Due after five through ten years | 652,909 |
Debt Securities, Fair Value, Due after ten years | 145,443 |
Debt Securities, Fair Value | 5,057,057 |
Asset-backed [Member] |  |
Investment Holdings [Line Items] |  |
Trading, Amortized Cost | 7,356 |
Trading, Fair Value | 7,466 |
Available for Sale, Amortized Cost | 4,499 |
Available for Sale, Fair Value | 4,731 |
Debt Securities, Amortized Cost | 11,855 |
Debt Securities, Fair Value | 12,197 |
Mortgage-backed [Member] |  |
Investment Holdings [Line Items] |  |
Trading, Amortized Cost | 1,115,304 |
Trading, Fair Value | 1,130,763 |
Available for Sale, Amortized Cost | 75,333 |
Available for Sale, Fair Value | 85,433 |
Debt Securities, Amortized Cost | 1,190,637 |
Debt Securities, Fair Value | $ 1,216,196 |

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- Definition Debt securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 -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 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
Name: | us-gaap_TradingSecuritiesDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant