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Fair Value Disclosures (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 21,658,414,000	$ 16,200,950,000
Funds withheld at interest embedded derivatives	(320,501,000)	(361,456,000)
Short-term investments	44,556,000	46,671,000
Other invested assets	495,852,000	462,945,000
Cash and cash equivalents	1,025,410,000	504,522,000
Reinsurance ceded receivable - embedded derivatives	4,192,000	4,945,000
Total Assets	22,907,923,000	16,858,577,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	953,804,000	1,028,241,000
Other liabilities	33,115,000	29,650,000
Total Liabilities	986,919,000	1,057,891,000
Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	277,000	3,171,000
Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	81,000	5,633,000
Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	32,757,000	23,710,000
Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities		(2,864,000)
Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	74,680,000	78,183,000
Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	134,592,000	35,717,000
Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	136,211,000	168,484,000
Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	4,016,000	4,560,000
Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	817,000	766,000
Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	(2,381,000)	(4,003,000)
Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	73,659,000	87,243,000
Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	37,202,000	32,622,000
Other [Member]
Assets Fair Value Disclosure
Other invested assets	37,056,000	59,373,000
Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	11,899,722,000	7,461,106,000
Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	4,091,883,000	3,869,933,000
Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,055,808,000	1,227,234,000
Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	572,700,000	401,991,000
Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,740,391,000	1,242,219,000
US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	284,857,000	374,002,000
US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	287,417,000	205,386,000
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,725,636,000	1,419,079,000
Fair Value Inputs Level 1 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	494,107,000	612,945,000
Funds withheld at interest embedded derivatives	0	0
Short-term investments	0	37,155,000
Other invested assets	270,120,000	150,639,000
Cash and cash equivalents	1,025,410,000	504,522,000
Reinsurance ceded receivable - embedded derivatives	0	0
Total Assets	1,789,637,000	1,305,261,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	0	0
Other liabilities	0	0
Total Liabilities	0	0
Fair Value Inputs Level 1 Member | Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities		0
Fair Value Inputs Level 1 Member | Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	63,874,000	58,906,000
Fair Value Inputs Level 1 Member | Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	134,592,000	5,308,000
Fair Value Inputs Level 1 Member | Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member | Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member | Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member | Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member | Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member | Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member | Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 1 Member | Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	34,598,000	27,052,000
Fair Value Inputs Level 1 Member | Other [Member]
Assets Fair Value Disclosure
Other invested assets	37,056,000	59,373,000
Fair Value Inputs Level 1 Member | Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	52,993,000	76,097,000
Fair Value Inputs Level 1 Member | Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	212,636,000	300,514,000
Fair Value Inputs Level 1 Member | US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	12,894,000
Fair Value Inputs Level 1 Member | Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	228,478,000	223,440,000
Fair Value Inputs Level 2 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	19,199,501,000	14,212,340,000
Funds withheld at interest embedded derivatives	0	0
Short-term investments	22,495,000	9,516,000
Other invested assets	225,732,000	300,817,000
Cash and cash equivalents	0	0
Reinsurance ceded receivable - embedded derivatives	0	0
Total Assets	19,447,728,000	14,522,673,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	0	0
Other liabilities	33,115,000	29,650,000
Total Liabilities	33,115,000	29,650,000
Fair Value Inputs Level 2 Member | Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	277,000	3,171,000
Fair Value Inputs Level 2 Member | Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	81,000	5,633,000
Fair Value Inputs Level 2 Member | Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	32,757,000	23,710,000
Fair Value Inputs Level 2 Member | Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities		(2,864,000)
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	10,806,000	19,277,000
Fair Value Inputs Level 2 Member | Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	0	18,920,000
Fair Value Inputs Level 2 Member | Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 2 Member | Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	136,211,000	168,484,000
Fair Value Inputs Level 2 Member | Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	4,016,000	4,560,000
Fair Value Inputs Level 2 Member | Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	817,000	766,000
Fair Value Inputs Level 2 Member | Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	(2,381,000)	(4,003,000)
Fair Value Inputs Level 2 Member | Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	73,659,000	87,243,000
Fair Value Inputs Level 2 Member | Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 2 Member | Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	2,604,000	5,570,000
Fair Value Inputs Level 2 Member | Other [Member]
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 2 Member | Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	10,339,456,000	6,410,840,000
Fair Value Inputs Level 2 Member | Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	4,091,883,000	3,869,933,000
Fair Value Inputs Level 2 Member | Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,006,449,000	1,145,579,000
Fair Value Inputs Level 2 Member | Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	383,110,000	208,499,000
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,573,323,000	1,126,243,000
Fair Value Inputs Level 2 Member | US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	67,655,000	73,488,000
Fair Value Inputs Level 2 Member | US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	240,467,000	182,119,000
Fair Value Inputs Level 2 Member | Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,497,158,000	1,195,639,000
Fair Value Inputs Level 3 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,964,806,000	1,375,665,000
Funds withheld at interest embedded derivatives	(320,501,000)	(361,456,000)
Short-term investments	22,061,000	0
Other invested assets	0	11,489,000
Cash and cash equivalents	0	0
Reinsurance ceded receivable - embedded derivatives	4,192,000	4,945,000
Total Assets	1,670,558,000	1,030,643,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	953,804,000	1,028,241,000
Other liabilities	0	0
Total Liabilities	953,804,000	1,028,241,000
Fair Value Inputs Level 3 Member | Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities		0
Fair Value Inputs Level 3 Member | Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	0	11,489,000
Fair Value Inputs Level 3 Member | Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Other [Member]
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,507,273,000	974,169,000
Fair Value Inputs Level 3 Member | Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 3 Member | Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	49,359,000	81,655,000
Fair Value Inputs Level 3 Member | Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	189,590,000	193,492,000
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	167,068,000	115,976,000
Fair Value Inputs Level 3 Member | US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	4,566,000	0
Fair Value Inputs Level 3 Member | US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	46,950,000	10,373,000
Fair Value Inputs Level 3 Member | Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 0	$ 0

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Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer.

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This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

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-Name Accounting Standards Codification

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-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.



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-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.



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-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.



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

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