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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, 2013
Dec. 31, 2012
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 21,289,108 $ 22,291,614
Funds withheld at interest embedded derivatives (175,933) (243,177)
Cash and cash equivalents 671,999 575,864
Short-term investments 19,436 239,131
Other invested assets 249,845 419,861
Total Assets 22,054,455 23,283,293
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 825,899 912,361
Total Liabilities 839,047 944,013
Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 82,839 74,841
Other equity securities
    
Assets Fair Value Disclosure    
Other invested assets 64,071 147,859
Securities Pledged As Collateral Member
    
Assets Fair Value Disclosure    
Other invested assets   17,002
Other
    
Assets Fair Value Disclosure    
Other invested assets 15,514 11,951
Interest Rate Swaps
    
Assets Fair Value Disclosure    
Other invested assets 29,102 104,972
Liabilities Fair Value Disclosure    
Other liabilities 2,286 196
Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets 5,699  
Foreign Currency Forwards
    
Assets Fair Value Disclosure    
Other invested assets 0 1,017
Liabilities Fair Value Disclosure    
Other liabilities 8,928 2,105
Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 43,482 62,514
Liabilities Fair Value Disclosure    
Other liabilities (139)  
Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets 112 1,446
Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 1,764 (1,741)
Liabilities Fair Value Disclosure    
Other liabilities (170) 1,953
Foreign Currency Swaps
    
Assets Fair Value Disclosure    
Other invested assets 7,262  
Liabilities Fair Value Disclosure    
Other liabilities 2,243 27,398
Corporate securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 11,934,562 12,380,071
Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,491,156 4,049,334
Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 951,838 1,042,064
Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 885,278 691,555
Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,453,114 1,698,903
US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 430,847 265,190
State and political subdivisions
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 297,729 302,498
Other foreign government, supranational and foreign government-sponsored enterprises
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,844,584 1,861,999
Fair Value Inputs Level 1 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 723,377 533,349
Funds withheld at interest embedded derivatives 0 0
Cash and cash equivalents 671,999 575,864
Short-term investments 12,761 178,923
Other invested assets 154,864 225,401
Total Assets 1,563,001 1,513,537
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 75,279 64,268
Fair Value Inputs Level 1 Member | Other equity securities
    
Assets Fair Value Disclosure    
Other invested assets 64,071 147,859
Fair Value Inputs Level 1 Member | Securities Pledged As Collateral Member
    
Assets Fair Value Disclosure    
Other invested assets   1,323
Fair Value Inputs Level 1 Member | Other
    
Assets Fair Value Disclosure    
Other invested assets 15,514 11,951
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 | 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 58,111 43,544
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 362,269 192,780
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 302,997 297,025
Fair Value Inputs Level 2 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 18,284,520 19,520,344
Funds withheld at interest embedded derivatives 0 0
Cash and cash equivalents 0 0
Short-term investments 6,675 38,177
Other invested assets 90,156 194,460
Total Assets 18,381,351 19,752,981
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 0 0
Total Liabilities 13,148 31,652
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 2,735 10,573
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   15,679
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 29,102 104,972
Liabilities Fair Value Disclosure    
Other liabilities 2,286 196
Fair Value Inputs Level 2 Member | Interest Rate Options
    
Assets Fair Value Disclosure    
Other invested assets 5,699  
Fair Value Inputs Level 2 Member | Foreign Currency Forwards
    
Assets Fair Value Disclosure    
Other invested assets 0 1,017
Liabilities Fair Value Disclosure    
Other liabilities 8,928 2,105
Fair Value Inputs Level 2 Member | Equity Option
    
Assets Fair Value Disclosure    
Other invested assets 43,482 62,514
Liabilities Fair Value Disclosure    
Other liabilities (139)  
Fair Value Inputs Level 2 Member | Consumer Price Index Swaps
    
Assets Fair Value Disclosure    
Other invested assets 112 1,446
Fair Value Inputs Level 2 Member | Credit Default Swaps
    
Assets Fair Value Disclosure    
Other invested assets 1,764 (1,741)
Liabilities Fair Value Disclosure    
Other liabilities (170) 1,953
Fair Value Inputs Level 2 Member | Foreign Currency Swaps
    
Assets Fair Value Disclosure    
Other invested assets 7,262  
Liabilities Fair Value Disclosure    
Other liabilities 2,243 27,398
Fair Value Inputs Level 2 Member | Corporate securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 10,356,155 10,667,964
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,491,156 4,049,334
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 818,567 948,133
Fair Value Inputs Level 2 Member | Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 457,198 459,164
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,328,173 1,531,897
Fair Value Inputs Level 2 Member | US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 65,156 67,872
Fair Value Inputs Level 2 Member | State and political subdivisions
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 253,688 259,286
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 1,514,427 1,536,694
Fair Value Inputs Level 3 Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,281,211 2,237,921
Funds withheld at interest embedded derivatives (175,933) (243,177)
Cash and cash equivalents 0 0
Short-term investments 0 22,031
Other invested assets 4,825 0
Total Assets 2,110,103 2,016,775
Liabilities Fair Value Disclosure    
Interest-sensitive contract liabilities - embedded derivatives 825,899 912,361
Total Liabilities 825,899 912,361
Fair Value Inputs Level 3 Member | Nonredeemable Preferred Stock [Member]
    
Assets Fair Value Disclosure    
Other invested assets 4,825 0
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 | 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 1,520,296 1,668,563
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 133,271 93,931
Fair Value Inputs Level 3 Member | Asset-backed securities
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 428,080 232,391
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 124,941 167,006
Fair Value Inputs Level 3 Member | US Treasury And Government Member
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,422 4,538
Fair Value Inputs Level 3 Member | State and political subdivisions
    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 44,041 43,212
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 $ 27,160 $ 28,280