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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 24,475,451 $ 21,474,136
Funds withheld at interest embedded derivatives 36,617 (176,270)
Cash and cash equivalents 425,636 371,345
Short-term investments 16,219 111,572
Other invested assets 477,220 628,992
Other Assets, Fair Value Disclosure 4,407  
Total Assets 25,435,550 22,409,775
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 1,017,927 868,725
Total Liabilities 1,036,403 884,936
Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 87,589 81,854
Other equity securities
    
Assets Fair Value Disclosure    
Other invested assets 74,361 323,877
Securities Pledged as Collateral [Member]
    
Assets Fair Value Disclosure    
Other invested assets   21,283
Other
    
Assets Fair Value Disclosure    
Other invested assets 9,591 9,142
Interest Rate Swaps
    
Assets Fair Value Disclosure    
Other invested assets 56,092 9,904
Liabilities Fair Value Disclosure    
Other liabilities 7,595 3,828
Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets 6,705 2,554
Foreign Currency Forwards
    
Liabilities Fair Value Disclosure    
Other liabilities 10,408 12,772
Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 40,966 33,869
Liabilities Fair Value Disclosure    
Other liabilities   (33)
Currency Swap [Member]
    
Assets Fair Value Disclosure    
Other invested assets 52,236  
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets Fair Value Disclosure    
Other invested assets 142,125 138,892
Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets (101) (309)
Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 7,656 7,926
Liabilities Fair Value Disclosure    
Other liabilities 153 (356)
Mortality Swap [Member]
    
Liabilities Fair Value Disclosure    
Other liabilities 320  
Corporate Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 14,190,456 12,110,755
Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,714,338 3,381,025
Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,000,717 989,643
Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,006,048 894,832
Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,481,822 1,388,946
US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 479,986 501,351
US States and Political Subdivisions Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 410,064 320,820
Foreign Government Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,192,020 1,886,764
Fair Value Inputs Level 1 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 784,891 769,513
Funds withheld at interest embedded derivatives 0 0
Cash and cash equivalents 425,636 371,345
Short-term investments 8,414 105,649
Other invested assets 307,991 539,882
Other Assets, Fair Value Disclosure 0  
Total Assets 1,526,932 1,786,389
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 0 0
Total Liabilities 0 0
Fair Value Inputs Level 1 Member | Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 87,589 74,220
Fair Value Inputs Level 1 Member | Other equity securities
    
Assets Fair Value Disclosure    
Other invested assets 74,361 323,877
Fair Value Inputs Level 1 Member | Securities Pledged as Collateral [Member]
    
Assets Fair Value Disclosure    
Other invested assets   0
Fair Value Inputs Level 1 Member | Other
    
Assets Fair Value Disclosure    
Other invested assets 9,591 9,142
Fair Value Inputs Level 1 Member | Interest Rate Swaps
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Liabilities Fair Value Disclosure    
Other liabilities 0 0
Fair Value Inputs Level 1 Member | Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets    0
Fair Value Inputs Level 1 Member | Foreign Currency Forwards
    
Liabilities Fair Value Disclosure    
Other liabilities 0 0
Fair Value Inputs Level 1 Member | Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Liabilities Fair Value Disclosure    
Other liabilities   0
Fair Value Inputs Level 1 Member | Currency Swap [Member]
    
Assets Fair Value Disclosure    
Other invested assets 0  
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets Fair Value Disclosure    
Other invested assets 136,450 132,643
Fair Value Inputs Level 1 Member | Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Fair Value Inputs Level 1 Member | Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Liabilities Fair Value Disclosure    
Other liabilities 0 0
Fair Value Inputs Level 1 Member | Mortality Swap [Member]
    
Liabilities Fair Value Disclosure    
Other liabilities 0  
Fair Value Inputs Level 1 Member | Corporate Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 115,707 68,934
Fair Value Inputs Level 1 Member | Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 0
Fair Value Inputs Level 1 Member | Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 0
Fair Value Inputs Level 1 Member | Asset-backed securities
    
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 389,358 396,092
Fair Value Inputs Level 1 Member | US States and Political Subdivisions Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 0
Fair Value Inputs Level 1 Member | Foreign Government Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 279,826 304,487
Fair Value Inputs Level 2 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 21,402,498 18,509,504
Funds withheld at interest embedded derivatives 0 0
Cash and cash equivalents 0 0
Short-term investments 7,805 5,923
Other invested assets 169,229 84,148
Other Assets, Fair Value Disclosure 0  
Total Assets 21,579,532 18,599,575
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 0 0
Total Liabilities 18,156 16,211
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 0 2,672
Fair Value Inputs Level 2 Member | Other equity securities
    
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   21,283
Fair Value Inputs Level 2 Member | Other
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Fair Value Inputs Level 2 Member | Interest Rate Swaps
    
Assets Fair Value Disclosure    
Other invested assets 56,092 9,904
Liabilities Fair Value Disclosure    
Other liabilities 7,595 3,828
Fair Value Inputs Level 2 Member | Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets 6,705 2,554
Fair Value Inputs Level 2 Member | Foreign Currency Forwards
    
Liabilities Fair Value Disclosure    
Other liabilities 10,408 12,772
Fair Value Inputs Level 2 Member | Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 40,966 33,869
Liabilities Fair Value Disclosure    
Other liabilities   (33)
Fair Value Inputs Level 2 Member | Currency Swap [Member]
    
Assets Fair Value Disclosure    
Other invested assets 52,236  
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets Fair Value Disclosure    
Other invested assets 5,675 6,249
Fair Value Inputs Level 2 Member | Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets (101) (309)
Fair Value Inputs Level 2 Member | Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 7,656 7,926
Liabilities Fair Value Disclosure    
Other liabilities 153 (356)
Fair Value Inputs Level 2 Member | Mortality Swap [Member]
    
Liabilities Fair Value Disclosure    
Other liabilities 0  
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 12,697,745 10,696,532
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,714,338 3,381,025
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 813,215 836,138
Fair Value Inputs Level 2 Member | Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 461,416 422,984
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,386,303 1,287,161
Fair Value Inputs Level 2 Member | US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 60,240 64,340
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 367,559 277,044
Fair Value Inputs Level 2 Member | Foreign Government Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,901,682 1,544,280
Fair Value Inputs Level 3 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,288,062 2,195,119
Funds withheld at interest embedded derivatives 36,617 (176,270)
Cash and cash equivalents 0 0
Short-term investments 0 0
Other invested assets 0 4,962
Other Assets, Fair Value Disclosure 4,407  
Total Assets 2,329,086 2,023,811
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 1,017,927 868,725
Total Liabilities 1,018,247 868,725
Fair Value Inputs Level 3 Member | Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 0 4,962
Fair Value Inputs Level 3 Member | Other equity securities
    
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
Fair Value Inputs Level 3 Member | Other
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Fair Value Inputs Level 3 Member | Interest Rate Swaps
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Liabilities Fair Value Disclosure    
Other liabilities 0 0
Fair Value Inputs Level 3 Member | Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Fair Value Inputs Level 3 Member | Foreign Currency Forwards
    
Liabilities Fair Value Disclosure    
Other liabilities 0 0
Fair Value Inputs Level 3 Member | Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Liabilities Fair Value Disclosure    
Other liabilities   0
Fair Value Inputs Level 3 Member | Currency Swap [Member]
    
Assets Fair Value Disclosure    
Other invested assets 0  
Fair Value Inputs Level 3 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Fair Value Inputs Level 3 Member | Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Fair Value Inputs Level 3 Member | Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 0 0
Liabilities Fair Value Disclosure    
Other liabilities 0 0
Fair Value Inputs Level 3 Member | Mortality Swap [Member]
    
Liabilities Fair Value Disclosure    
Other liabilities 320  
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,377,004 1,345,289
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 0
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 187,502 153,505
Fair Value Inputs Level 3 Member | Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 544,632 471,848
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 95,519 101,785
Fair Value Inputs Level 3 Member | US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 30,388 40,919
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 42,505 43,776
Fair Value Inputs Level 3 Member | Foreign Government Debt Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 10,512 $ 37,997