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Subsequent Event (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended
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Jul. 31, 2012
Amortized Cost Recorded Investment [Member] | Corporate Debt Securities Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | $ 2,585,095
Amortized Cost Recorded Investment [Member] | Asset Backed Securities Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 137,251
Amortized Cost Recorded Investment [Member] | Commercial Mortgage Backed Securities Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 703,313
Amortized Cost Recorded Investment [Member] | US Government Corporations and Agencies Securities [Member] |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 240,952
Amortized Cost Recorded Investment [Member] | US States And Political Subdivisions Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 27,297
Amortized Cost Recorded Investment [Member] | Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 56,776
Amortized Cost Recorded Investment [Member] | Mortgage Loans On Real Estate Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 1,009,454
Amortized Cost Recorded Investment [Member] | Short Term Investments Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 101,428
Amortized Cost Recorded Investment [Member] | Cash and Cash Equivalents [Member] |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 501,593
Amortized Cost Recorded Investment [Member] | Accrued Income Receivable [Member] |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 43,739
Amortized Cost Recorded Investment [Member] | Availableforsale Securities Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 3,750,684
Amortized Cost Recorded Investment [Member] | Total Subsequent Event [Member] |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 5,406,898
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 2,606,816
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset Backed Securities Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 138,918
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial Mortgage Backed Securities Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 704,065
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Corporations and Agencies Securities [Member] |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 256,168
Estimate of Fair Value, Fair Value Disclosure [Member] | US States And Political Subdivisions Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 27,555
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 55,437
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgage Loans On Real Estate Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 1,021,661
Estimate of Fair Value, Fair Value Disclosure [Member] | Short Term Investments Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 101,338
Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and Cash Equivalents [Member] |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 501,593
Estimate of Fair Value, Fair Value Disclosure [Member] | Accrued Income Receivable [Member] |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 43,739
Estimate of Fair Value, Fair Value Disclosure [Member] | Availableforsale Securities Member |
Subsequent Event [Line Items] |
Subsequent Event, Amount | 3,788,959
Estimate of Fair Value, Fair Value Disclosure [Member] | Total Subsequent Event [Member] |
Subsequent Event [Line Items] |
Subsequent Event, Amount | $ 5,457,290

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- Definition Reflects the known or estimated financial effect of the event, or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Topic 855 -SubTopic 10 -Section 50 -Paragraph 2 -Name Accounting Standards Codification -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 165 -Paragraph 13 -Subparagraph b -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. + Details
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Period Type: | duration

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- Details
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Period Type: | duration