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Fair Value Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	$ 17,244,192	$ 16,200,950
Funds withheld at interest embedded derivatives	(375,337)	(361,456)
Short-term investments	3,704	46,671
Other invested assets	366,700	462,945
Cash and cash equivalents	378,595	504,522
Reinsurance ceded receivable - embedded derivatives	4,416	4,945
Total Assets	17,622,270	16,858,577
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	938,927	1,028,241
Other liabilities	25,739	29,650
Total Liabilities	964,666	1,057,891
Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	132	3,171
Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	2,453	5,633
Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	23,154	23,710
Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities		(2,864)
Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	75,970	78,183
Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	3,227	35,717
Future Member
Assets Fair Value Disclosure
Other invested assets	0	0
Interest Rate Swap Member
Assets Fair Value Disclosure
Other invested assets	156,866	168,484
Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	3,275	4,560
Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	388	766
Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	(4,369)	(4,003)
Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	94,300	87,243
Currency Swap Member
Assets Fair Value Disclosure
Other invested assets	0	0
Securities Pledged As Collateral Member
Assets Fair Value Disclosure
Other invested assets	26,448	32,622
Other [Member]
Assets Fair Value Disclosure
Other invested assets	10,595	59,373
Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	8,401,909	7,461,106
Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,929,374	3,869,933
Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,078,562	1,227,234
Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	441,051	401,991
Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,348,047	1,242,219
US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	249,914	374,002
US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	229,776	205,386
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,565,559	1,419,079
Fair Value Inputs Level 1 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	475,332	612,945
Funds withheld at interest embedded derivatives	0	0
Short-term investments	110	37,155
Other invested assets	93,539	150,639
Cash and cash equivalents	378,595	504,522
Reinsurance ceded receivable - embedded derivatives	0	0
Total Assets	947,576	1,305,261
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	62,131	58,906
Fair Value Inputs Level 1 Member | Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	0	5,308
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	20,813	27,052
Fair Value Inputs Level 1 Member | Other [Member]
Assets Fair Value Disclosure
Other invested assets	10,595	59,373
Fair Value Inputs Level 1 Member | Corporate Debt Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	69,954	76,097
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	182,787	300,514
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
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	222,591	223,440
Fair Value Inputs Level 2 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	15,466,678	14,212,340
Funds withheld at interest embedded derivatives	0	0
Short-term investments	3,594	9,516
Other invested assets	269,934	300,817
Cash and cash equivalents	0	0
Reinsurance ceded receivable - embedded derivatives	0	0
Total Assets	15,740,206	14,522,673
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	0	0
Other liabilities	25,739	29,650
Total Liabilities	25,739	29,650
Fair Value Inputs Level 2 Member | Interest Rate Swap Member
Liabilities Fair Value Disclosure
Other liabilities	132	3,171
Fair Value Inputs Level 2 Member | Credit Default Swap Member
Liabilities Fair Value Disclosure
Other liabilities	2,453	5,633
Fair Value Inputs Level 2 Member | Currency Swap Member
Liabilities Fair Value Disclosure
Other liabilities	23,154	23,710
Fair Value Inputs Level 2 Member | Equity Securities Other Member
Liabilities Fair Value Disclosure
Other liabilities		(2,864)
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock Member
Assets Fair Value Disclosure
Other invested assets	13,839	19,277
Fair Value Inputs Level 2 Member | Equity Securities Other Member
Assets Fair Value Disclosure
Other invested assets	0	18,920
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	156,866	168,484
Fair Value Inputs Level 2 Member | Forward Contracts Member
Assets Fair Value Disclosure
Other invested assets	3,275	4,560
Fair Value Inputs Level 2 Member | Credit Index Product Member
Assets Fair Value Disclosure
Other invested assets	388	766
Fair Value Inputs Level 2 Member | Credit Default Swap Member
Assets Fair Value Disclosure
Other invested assets	(4,369)	(4,003)
Fair Value Inputs Level 2 Member | Equity Swap Member
Assets Fair Value Disclosure
Other invested assets	94,300	87,243
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	5,635	5,570
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	7,337,941	6,410,840
Fair Value Inputs Level 2 Member | Canadian Provincial Governments [Member]
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	3,929,374	3,869,933
Fair Value Inputs Level 2 Member | Residential Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,028,971	1,145,579
Fair Value Inputs Level 2 Member | Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	312,693	208,499
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,232,314	1,126,243
Fair Value Inputs Level 2 Member | US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	67,127	73,488
Fair Value Inputs Level 2 Member | US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	215,290	182,119
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	1,342,968	1,195,639
Fair Value Inputs Level 3 Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	1,302,182	1,375,665
Funds withheld at interest embedded derivatives	(375,337)	(361,456)
Short-term investments	0	0
Other invested assets	3,227	11,489
Cash and cash equivalents	0	0
Reinsurance ceded receivable - embedded derivatives	4,416	4,945
Total Assets	934,488	1,030,643
Liabilities Fair Value Disclosure
Interest-sensitive contract liabilities - embedded derivatives	938,927	1,028,241
Other liabilities	0	0
Total Liabilities	938,927	1,028,241
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	3,227	11,489
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	994,014	974,169
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	49,591	81,655
Fair Value Inputs Level 3 Member | Asset Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	128,358	193,492
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	115,733	115,976
Fair Value Inputs Level 3 Member | US Treasury And Government Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 3 Member | US States And Political Subdivisions Member
Assets Fair Value Disclosure
Fixed maturity securities, available-for-sale	14,486	10,373
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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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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- Definition

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

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-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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-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

-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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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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