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Fair Value Disclosures (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 22,401,659,000	$ 22,291,614,000
Funds withheld at interest embedded derivatives	(156,189,000)	(243,177,000)
Short-term investments	157,281,000	239,131,000
Other invested assets	405,421,000	419,861,000
Cash and cash equivalents	367,876,000	575,864,000
Total Assets	23,176,048,000	23,283,293,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	890,476,000	912,361,000
Other liabilities	18,604,000	31,652,000
Total Liabilities	909,080,000	944,013,000
Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	1,463,000	196,000
Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	(120,000)	1,953,000
Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	10,687,000	27,398,000
Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities	(440,000)
Forward Contracts Member
Liabilities Fair Value Disclosure
Other liabilities	7,014,000	2,105,000
Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	84,111,000	74,841,000
Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	136,554,000	147,859,000
Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	83,662,000	104,972,000
Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	0	1,017,000
Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	945,000	1,446,000
Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	(3,391,000)	(1,741,000)
Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	54,351,000	62,514,000
Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	140,000	0
Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	25,790,000	17,002,000
Other [Member]
Assets Fair Value Disclosure
Other invested assets	7,205,000	11,951,000
Interest Rate Options [Member]
Assets Fair Value Disclosure
Other invested assets	16,054,000
Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	12,441,501,000	12,380,071,000
Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,942,198,000	4,049,334,000
Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,076,770,000	1,042,064,000
Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	756,544,000	691,555,000
Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,698,144,000	1,698,903,000
US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	331,201,000	265,190,000
US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	313,097,000	302,498,000
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,842,204,000	1,861,999,000
Fair Value Inputs Level 1 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	598,605,000	533,349,000
Funds withheld at interest embedded derivatives	0	0
Short-term investments	118,621,000	178,923,000
Other invested assets	231,323,000	225,401,000
Cash and cash equivalents	367,876,000	575,864,000
Total Assets	1,316,425,000	1,513,537,000
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 | Forward Contracts Member
Liabilities Fair Value Disclosure
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	73,446,000	64,268,000
Fair Value Inputs Level 1 Member | Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	136,554,000	147,859,000
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	14,118,000	1,323,000
Fair Value Inputs Level 1 Member | Other [Member]
Assets Fair Value Disclosure
Other invested assets	7,205,000	11,951,000
Fair Value Inputs Level 1 Member | Interest Rate Options [Member]
Assets Fair Value Disclosure
Other invested assets	0
Fair Value Inputs Level 1 Member | Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	65,890,000	43,544,000
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	259,892,000	192,780,000
Fair Value Inputs Level 1 Member | US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
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	272,823,000	297,025,000
Fair Value Inputs Level 2 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	19,481,405,000	19,520,344,000
Funds withheld at interest embedded derivatives	0	0
Short-term investments	16,659,000	38,177,000
Other invested assets	174,098,000	194,460,000
Cash and cash equivalents	0	0
Total Assets	19,672,162,000	19,752,981,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	0	0
Other liabilities	18,604,000	31,652,000
Total Liabilities	18,604,000	31,652,000
Fair Value Inputs Level 2 Member | Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	1,463,000	196,000
Fair Value Inputs Level 2 Member | Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	(120,000)	1,953,000
Fair Value Inputs Level 2 Member | Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	10,687,000	27,398,000
Fair Value Inputs Level 2 Member | Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities	(440,000)
Fair Value Inputs Level 2 Member | Forward Contracts Member
Liabilities Fair Value Disclosure
Other liabilities	7,014,000	2,105,000
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	10,665,000	10,573,000
Fair Value Inputs Level 2 Member | Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	0	0
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	83,662,000	104,972,000
Fair Value Inputs Level 2 Member | Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	0	1,017,000
Fair Value Inputs Level 2 Member | Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	945,000	1,446,000
Fair Value Inputs Level 2 Member | Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	(3,391,000)	(1,741,000)
Fair Value Inputs Level 2 Member | Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	54,351,000	62,514,000
Fair Value Inputs Level 2 Member | Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	140,000	0
Fair Value Inputs Level 2 Member | Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	11,672,000	15,679,000
Fair Value Inputs Level 2 Member | Other [Member]
Assets Fair Value Disclosure
Other invested assets	0	0
Fair Value Inputs Level 2 Member | Interest Rate Options [Member]
Assets Fair Value Disclosure
Other invested assets	16,054,000
Fair Value Inputs Level 2 Member | Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	10,728,708,000	10,667,964,000
Fair Value Inputs Level 2 Member | Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,942,198,000	4,049,334,000
Fair Value Inputs Level 2 Member | Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	936,053,000	948,133,000
Fair Value Inputs Level 2 Member | Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	468,313,000	459,164,000
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,522,850,000	1,531,897,000
Fair Value Inputs Level 2 Member | US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	71,309,000	67,872,000
Fair Value Inputs Level 2 Member | US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	270,458,000	259,286,000
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	1,541,516,000	1,536,694,000
Fair Value Inputs Level 3 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	2,321,649,000	2,237,921,000
Funds withheld at interest embedded derivatives	(156,189,000)	(243,177,000)
Short-term investments	22,001,000	22,031,000
Other invested assets	0	0
Cash and cash equivalents	0	0
Total Assets	2,187,461,000	2,016,775,000
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	890,476,000	912,361,000
Other liabilities	0	0
Total Liabilities	890,476,000	912,361,000
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 | Forward Contracts Member
Liabilities Fair Value Disclosure
Other liabilities	0	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	0
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 | Interest Rate Options [Member]
Assets Fair Value Disclosure
Other invested assets	0
Fair Value Inputs Level 3 Member | Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,646,903,000	1,668,563,000
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	140,717,000	93,931,000
Fair Value Inputs Level 3 Member | Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	288,231,000	232,391,000
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	175,294,000	167,006,000
Fair Value Inputs Level 3 Member | US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	4,538,000
Fair Value Inputs Level 3 Member | US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	42,639,000	43,212,000
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	$ 27,865,000	$ 28,280,000

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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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This element represents the aggregate of the assets 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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 12

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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.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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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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-Publisher FASB

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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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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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

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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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