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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
Jun. 30, 2014
Dec. 31, 2013
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 24,480,396 $ 21,474,136
Funds withheld at interest embedded derivatives (20,194) (176,270)
Cash and cash equivalents 516,798 371,345
Short-term investments 21,702 111,572
Other invested assets 445,648 628,992
Total Assets 25,444,350 22,409,775
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 940,236 868,725
Total Liabilities 948,640 884,936
Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 86,838 81,854
Other equity securities
    
Assets Fair Value Disclosure    
Other invested assets 53,906 323,877
Securities Pledged as Collateral [Member]
    
Assets Fair Value Disclosure    
Other invested assets   21,283
Other
    
Assets Fair Value Disclosure    
Other invested assets 17,407 9,142
Interest Rate Swaps
    
Assets Fair Value Disclosure    
Other invested assets 56,229 9,904
Liabilities Fair Value Disclosure    
Other liabilities 865 3,828
Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets 5,840 2,554
Foreign Currency Forwards
    
Liabilities Fair Value Disclosure    
Other liabilities 7,679 12,772
Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 39,948 33,869
Liabilities Fair Value Disclosure    
Other liabilities   (33)
Currency Swap [Member]
    
Assets Fair Value Disclosure    
Other invested assets 23,059  
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets Fair Value Disclosure    
Other invested assets 151,726 138,892
Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets 69 (309)
Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 10,626 7,926
Liabilities Fair Value Disclosure    
Other liabilities (140) (356)
Corporate securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 14,151,411 12,110,755
Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,747,638 3,381,025
Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 986,139 989,643
Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,008,375 894,832
Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,474,620 1,388,946
US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 448,506 501,351
State and political subdivisions
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 407,487 320,820
Other foreign government, supranational and foreign government-sponsored enterprises
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,256,220 1,886,764
Fair Value Inputs Level 1 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 765,188 769,513
Funds withheld at interest embedded derivatives 0 0
Cash and cash equivalents 516,798 371,345
Short-term investments 10,085 105,649
Other invested assets 303,403 539,882
Total Assets 1,595,474 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 86,838 74,220
Fair Value Inputs Level 1 Member | Other equity securities
    
Assets Fair Value Disclosure    
Other invested assets 53,906 323,877
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 17,407 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 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 145,252 132,643
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 | Corporate securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 107,831 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 350,852 396,092
Fair Value Inputs Level 1 Member | State and political subdivisions
    
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 306,505 304,487
Fair Value Inputs Level 2 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 21,497,998 18,509,504
Funds withheld at interest embedded derivatives 0 0
Cash and cash equivalents 0 0
Short-term investments 11,617 5,923
Other invested assets 142,245 84,148
Total Assets 21,651,860 18,599,575
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 0 0
Total Liabilities 8,404 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 56,229 9,904
Liabilities Fair Value Disclosure    
Other liabilities 865 3,828
Fair Value Inputs Level 2 Member | Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets 5,840 2,554
Fair Value Inputs Level 2 Member | Foreign Currency Forwards
    
Liabilities Fair Value Disclosure    
Other liabilities 7,679 12,772
Fair Value Inputs Level 2 Member | Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 39,948 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 23,059  
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets Fair Value Disclosure    
Other invested assets 6,474 6,249
Fair Value Inputs Level 2 Member | Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets 69 (309)
Fair Value Inputs Level 2 Member | Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 10,626 7,926
Liabilities Fair Value Disclosure    
Other liabilities (140) (356)
Fair Value Inputs Level 2 Member | Corporate securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 12,755,640 10,696,532
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,747,638 3,381,025
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 800,592 836,138
Fair Value Inputs Level 2 Member | Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 452,215 422,984
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,376,706 1,287,161
Fair Value Inputs Level 2 Member | US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 64,660 64,340
Fair Value Inputs Level 2 Member | State and political subdivisions
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 361,720 277,044
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 1,938,827 1,544,280
Fair Value Inputs Level 3 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,217,210 2,195,119
Funds withheld at interest embedded derivatives (20,194) (176,270)
Cash and cash equivalents 0 0
Short-term investments 0 0
Other invested assets 0 4,962
Total Assets 2,197,016 2,023,811
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 940,236 868,725
Total Liabilities 940,236 868,725
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 | Corporate securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,287,940 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 185,547 153,505
Fair Value Inputs Level 3 Member | Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 556,160 471,848
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 97,914 101,785
Fair Value Inputs Level 3 Member | US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 32,994 40,919
Fair Value Inputs Level 3 Member | State and political subdivisions
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 45,767 43,776
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 $ 10,888 $ 37,997