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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
Mar. 31, 2014
Dec. 31, 2013
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 22,157,182 $ 21,474,136
Funds withheld at interest embedded derivatives (99,029) (176,270)
Cash and cash equivalents 532,957 371,345
Short-term investments 85,292 111,572
Other invested assets 557,723 628,992
Total Assets 23,234,125 22,409,775
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 911,987 868,725
Total Liabilities 925,552 884,936
Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 88,767 81,854
Other equity securities
    
Assets Fair Value Disclosure    
Other invested assets 193,248 323,877
Securities Pledged as Collateral [Member]
    
Assets Fair Value Disclosure    
Other invested assets   21,283
Other
    
Assets Fair Value Disclosure    
Other invested assets 7,193 9,142
Interest Rate Swaps
    
Assets Fair Value Disclosure    
Other invested assets 34,911 9,904
Liabilities Fair Value Disclosure    
Other liabilities 3,295 3,828
Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets 3,836  
Foreign Currency Forwards
    
Assets Fair Value Disclosure    
Other invested assets 0 2,554
Liabilities Fair Value Disclosure    
Other liabilities 10,067 12,772
Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 30,862 33,869
Liabilities Fair Value Disclosure    
Other liabilities (4)  
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets Fair Value Disclosure    
Other invested assets 147,342 138,892
Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets (70) (309)
Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 7,421 7,926
Liabilities Fair Value Disclosure    
Other liabilities 207 (356)
Foreign Currency Swaps
    
Assets Fair Value Disclosure    
Other invested assets 44,213  
Liabilities Fair Value Disclosure    
Other liabilities 0 (33)
Corporate securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 12,518,300 12,110,755
Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,450,164 3,381,025
Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,001,871 989,643
Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 944,579 894,832
Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,450,503 1,388,946
US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 462,262 501,351
State and political subdivisions
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 390,632 320,820
Other foreign government, supranational and foreign government-sponsored enterprises
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,938,871 1,886,764
Fair Value Inputs Level 1 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 729,478 769,513
Funds withheld at interest embedded derivatives 0 0
Cash and cash equivalents 532,957 371,345
Short-term investments 78,710 105,649
Other invested assets 428,482 539,882
Total Assets 1,769,627 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 87,382 74,220
Fair Value Inputs Level 1 Member | Other equity securities
    
Assets Fair Value Disclosure    
Other invested assets 193,248 323,877
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 7,193 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
    
Assets Fair Value Disclosure    
Other invested assets 0 0
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 | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets Fair Value Disclosure    
Other invested assets 140,659 132,643
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 | Foreign Currency Swaps
    
Assets Fair Value Disclosure    
Other invested assets 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 71,152 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 360,017 396,092
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 298,309 304,487
Fair Value Inputs Level 2 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 19,272,007 18,509,504
Funds withheld at interest embedded derivatives 0 0
Cash and cash equivalents 0 0
Short-term investments 6,582 5,923
Other invested assets 129,241 84,148
Total Assets 19,407,830 18,599,575
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 0 0
Total Liabilities 13,565 16,211
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 1,385 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 34,911 9,904
Liabilities Fair Value Disclosure    
Other liabilities 3,295 3,828
Fair Value Inputs Level 2 Member | Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets 3,836  
Fair Value Inputs Level 2 Member | Foreign Currency Forwards
    
Assets Fair Value Disclosure    
Other invested assets 0 2,554
Liabilities Fair Value Disclosure    
Other liabilities 10,067 12,772
Fair Value Inputs Level 2 Member | Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 30,862 33,869
Liabilities Fair Value Disclosure    
Other liabilities (4)  
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets Fair Value Disclosure    
Other invested assets 6,683 6,249
Fair Value Inputs Level 2 Member | Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets (70) (309)
Fair Value Inputs Level 2 Member | Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 7,421 7,926
Liabilities Fair Value Disclosure    
Other liabilities 207 (356)
Fair Value Inputs Level 2 Member | Foreign Currency Swaps
    
Assets Fair Value Disclosure    
Other invested assets 44,213  
Liabilities Fair Value Disclosure    
Other liabilities 0 (33)
Fair Value Inputs Level 2 Member | Corporate securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 11,155,447 10,696,532
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,450,164 3,381,025
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 823,944 836,138
Fair Value Inputs Level 2 Member | Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 441,904 422,984
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,360,130 1,287,161
Fair Value Inputs Level 2 Member | US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 64,214 64,340
Fair Value Inputs Level 2 Member | State and political subdivisions
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 346,799 277,044
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 1,629,405 1,544,280
Fair Value Inputs Level 3 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,155,697 2,195,119
Funds withheld at interest embedded derivatives (99,029) (176,270)
Cash and cash equivalents 0 0
Short-term investments 0 0
Other invested assets 0 4,962
Total Assets 2,056,668 2,023,811
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 911,987 868,725
Total Liabilities 911,987 868,725
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  
Fair Value Inputs Level 3 Member | Foreign Currency Forwards
    
Assets Fair Value Disclosure    
Other invested assets 0 0
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 | 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 | Foreign Currency Swaps
    
Assets Fair Value Disclosure    
Other invested assets 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 1,291,701 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 177,927 153,505
Fair Value Inputs Level 3 Member | Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 502,675 471,848
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 90,373 101,785
Fair Value Inputs Level 3 Member | US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 38,031 40,919
Fair Value Inputs Level 3 Member | State and political subdivisions
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 43,833 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 $ 11,157 $ 37,997