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Fair Value Disclosures (Details 1) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 15,153,807 $ 14,304,597
Funds withheld at interest – embedded derivatives (173,160) (274,220)
Short-term investments 35,845 7,310
Other invested assets 261,065 223,363
Cash and cash equivalents 313,675 253,746
Reinsurance ceded receivable - embedded derivatives 86,029 75,431
Total Assets 15,677,261 14,590,227
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 804,171 721,485
Other liabilities 69,243 64,730
Total Liabilities 873,414 786,215
Fair Value Inputs Level 1 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 406,460 193,945
Funds withheld at interest – embedded derivatives 0 0
Short-term investments 29,297 5,257
Other invested assets 152,305 125,742
Cash and cash equivalents 313,675 253,746
Reinsurance ceded receivable - embedded derivatives 0 0
Total Assets 901,737 578,690
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 | Corporate Debt Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 13,558 16,182
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 186,346 166,861
Fair Value Inputs Level 1 Member | US States And Political Subdivisions Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 6,942 6,865
Fair Value Inputs Level 1 Member | Foreign Government Debt Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 199,614 4,037
Fair Value Inputs Level 1 Member | Nonredeemable Preferred Stock Member
    
Assets Fair Value Disclosure    
Other invested assets 87,181 72,393
Fair Value Inputs Level 1 Member | Equity Securities Other Member
    
Assets Fair Value Disclosure    
Other invested assets 4,787 5,126
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 60,337 48,223
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 2 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 13,299,813 12,665,349
Funds withheld at interest – embedded derivatives 0 0
Short-term investments 6,548 2,053
Other invested assets 97,759 80,785
Cash and cash equivalents 0 0
Reinsurance ceded receivable - embedded derivatives 0 0
Total Assets 13,404,120 12,748,187
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 0 0
Other liabilities 69,243 64,730
Total Liabilities 69,243 64,730
Fair Value Inputs Level 2 Member | Corporate Debt Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 6,705,950 6,266,987
Fair Value Inputs Level 2 Member | Canadian Provincial Governments Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,208,156 3,023,483
Fair Value Inputs Level 2 Member | Residential Mortgage Backed Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,262,354 1,289,786
Fair Value Inputs Level 2 Member | Asset Backed Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 188,147 162,651
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,208,340 1,190,297
Fair Value Inputs Level 2 Member | US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 14,932 39,355
Fair Value Inputs Level 2 Member | US States And Political Subdivisions Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 168,490 150,612
Fair Value Inputs Level 2 Member | Foreign Government Debt Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 543,444 542,178
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock Member
    
Assets Fair Value Disclosure    
Other invested assets 20,337 26,737
Fair Value Inputs Level 2 Member | Equity Securities Other Member
    
Assets Fair Value Disclosure    
Other invested assets 18,920 19,119
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 7,960 20,042
Fair Value Inputs Level 2 Member | Forward Contracts Member
    
Assets Fair Value Disclosure    
Other invested assets 5,706 5,924
Fair Value Inputs Level 2 Member | Credit Index Product Member
    
Assets Fair Value Disclosure    
Other invested assets 1,667 1,491
Fair Value Inputs Level 2 Member | Credit Default Swap Member
    
Assets Fair Value Disclosure    
Other invested assets (1,157) 2,429
Fair Value Inputs Level 2 Member | Equity Swap Member
    
Assets Fair Value Disclosure    
Other invested assets 44,326 5,043
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 0 0
Fair Value Inputs Level 2 Member | Interest Rate Swap Member
    
Liabilities Fair Value Disclosure    
Other liabilities 1,984 18,850
Fair Value Inputs Level 2 Member | Credit Default Swap Member
    
Liabilities Fair Value Disclosure    
Other liabilities 834 131
Fair Value Inputs Level 2 Member | Currency Swap Member
    
Liabilities Fair Value Disclosure    
Other liabilities 66,425 45,749
Fair Value Inputs Level 3 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,447,534 1,445,303
Funds withheld at interest – embedded derivatives (173,160) (274,220)
Short-term investments 0 0
Other invested assets 11,001 16,836
Cash and cash equivalents 0 0
Reinsurance ceded receivable - embedded derivatives 86,029 75,431
Total Assets 1,371,404 1,263,350
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 804,171 721,485
Other liabilities 0 0
Total Liabilities 804,171 721,485
Fair Value Inputs Level 3 Member | Corporate Debt Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 977,560 872,336
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 103,430 183,291
Fair Value Inputs Level 3 Member | Asset Backed Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 188,773 228,558
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 150,765 147,556
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 22,932 6,983
Fair Value Inputs Level 3 Member | Foreign Government Debt Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 4,074 6,579
Fair Value Inputs Level 3 Member | Nonredeemable Preferred Stock Member
    
Assets Fair Value Disclosure    
Other invested assets 0 420
Fair Value Inputs Level 3 Member | Equity Securities Other Member
    
Assets Fair Value Disclosure    
Other invested assets 11,001 16,416
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 | 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
Corporate Debt Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 7,697,068 7,155,505
Canadian Provincial Governments Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,208,156 3,023,483
Residential Mortgage Backed Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,365,784 1,473,077
Asset Backed Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 376,920 391,209
Commercial Mortgage Backed Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,359,105 1,337,853
US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 201,278 206,216
US States And Political Subdivisions Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 198,364 164,460
Foreign Government Debt Securities Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 747,132 552,794
Nonredeemable Preferred Stock Member
    
Assets Fair Value Disclosure    
Other invested assets 107,518 99,550
Equity Securities Other Member
    
Assets Fair Value Disclosure    
Other invested assets 34,708 40,661
Future Member
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Interest Rate Swap Member
    
Assets Fair Value Disclosure    
Other invested assets 7,960 20,042
Interest Rate Swap Member
    
Liabilities Fair Value Disclosure    
Other liabilities 1,984 18,850
Forward Contracts Member
    
Assets Fair Value Disclosure    
Other invested assets 5,706 5,924
Credit Index Product Member
    
Assets Fair Value Disclosure    
Other invested assets 1,667 1,491
Credit Default Swap Member
    
Assets Fair Value Disclosure    
Other invested assets (1,157) 2,429
Credit Default Swap Member
    
Liabilities Fair Value Disclosure    
Other liabilities 834 131
Equity Swap Member
    
Assets Fair Value Disclosure    
Other invested assets 44,326 5,043
Currency Swap Member
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Currency Swap Member
    
Liabilities Fair Value Disclosure    
Other liabilities 66,425 45,749
Securities Pledged As Collateral Member
    
Assets Fair Value Disclosure    
Other invested assets $ 60,337 $ 48,223