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Investments (Details 20) (USD $)	12 Months Ended
	Dec. 31, 2012
Amortized Cost Recorded Investment [Member] | Corporate Debt Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	$ 2,585,095,000
Amortized Cost Recorded Investment [Member] | Asset-backed Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	137,251,000
Amortized Cost Recorded Investment [Member] | Commercial Mortgage Backed Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	703,313,000
Amortized Cost Recorded Investment [Member] | USGovernmentCorporationsAndAgenciesSecuritiesMember
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	240,952,000
Amortized Cost Recorded Investment [Member] | US States and Political Subdivisions Debt Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	27,297,000
Amortized Cost Recorded Investment [Member] | Foreign Government Debt Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	56,776,000
Amortized Cost Recorded Investment [Member] | Mortgage Loans on Real Estate [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	1,009,454,000
Amortized Cost Recorded Investment [Member] | Short-term Investments [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	101,428,000
Amortized Cost Recorded Investment [Member] | Cash and Cash Equivalents [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	501,593,000
Amortized Cost Recorded Investment [Member] | AccruedIncomeReceivableMember
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	43,739,000
Amortized Cost Recorded Investment [Member] | Available-for-sale Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	3,750,684,000
Amortized Cost Recorded Investment [Member] | Total Transfer Of Investments [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	5,406,898,000
EstimateOfFairValueFairValueDisclosureMember | Corporate Debt Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	2,606,816,000
EstimateOfFairValueFairValueDisclosureMember | Asset-backed Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	138,918,000
EstimateOfFairValueFairValueDisclosureMember | Commercial Mortgage Backed Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	704,065,000
EstimateOfFairValueFairValueDisclosureMember | USGovernmentCorporationsAndAgenciesSecuritiesMember
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	256,168,000
EstimateOfFairValueFairValueDisclosureMember | US States and Political Subdivisions Debt Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	27,555,000
EstimateOfFairValueFairValueDisclosureMember | Foreign Government Debt Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	55,437,000
EstimateOfFairValueFairValueDisclosureMember | Mortgage Loans on Real Estate [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	1,021,661,000
EstimateOfFairValueFairValueDisclosureMember | Short-term Investments [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	101,338,000
EstimateOfFairValueFairValueDisclosureMember | Cash and Cash Equivalents [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	501,593,000
EstimateOfFairValueFairValueDisclosureMember | AccruedIncomeReceivableMember
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	43,739,000
EstimateOfFairValueFairValueDisclosureMember | Available-for-sale Securities [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	3,788,959,000
EstimateOfFairValueFairValueDisclosureMember | Total Transfer Of Investments [Member]
Noncash Investing And Financing Items [Line Items]
TransferOfInvestments	$ 5,457,290,000

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- Definition

Value of investments transferred in noncash transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-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 Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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