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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
Dec. 31, 2013
Dec. 31, 2012
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale $ 21,474,136 $ 22,291,614
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives (176,270) (243,177)
Cash and Cash Equivalents, Fair Value Disclosure 371,345 575,864
Fair Value Measured On Recurring Basis Short Term Investments 111,572 239,131
Other Assets, Fair Value Disclosure 628,992 419,861
Total 22,409,775 23,283,293
Liabilities, Fair Value Disclosure [Abstract]    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 868,725 912,361
Total 884,936 944,013
Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 769,513 533,349
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives 0 0
Cash and Cash Equivalents, Fair Value Disclosure 371,345 575,864
Fair Value Measured On Recurring Basis Short Term Investments 105,649 178,923
Other Assets, Fair Value Disclosure 539,882 225,401
Total 1,786,389 1,513,537
Liabilities, Fair Value Disclosure [Abstract]    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 0 0
Total 0 0
Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 18,509,504 19,520,344
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives 0 0
Cash and Cash Equivalents, Fair Value Disclosure 0 0
Fair Value Measured On Recurring Basis Short Term Investments 5,923 38,177
Other Assets, Fair Value Disclosure 84,148 194,460
Total 18,599,575 19,752,981
Liabilities, Fair Value Disclosure [Abstract]    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 0 0
Total 16,211 31,652
Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 2,195,119 2,237,921
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives (176,270) (243,177)
Cash and Cash Equivalents, Fair Value Disclosure 0 0
Fair Value Measured On Recurring Basis Short Term Investments 0 22,031
Other Assets, Fair Value Disclosure 4,962 0
Total 2,023,811 2,016,775
Liabilities, Fair Value Disclosure [Abstract]    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 868,725 912,361
Total 868,725 912,361
Nonredeemable Preferred Stock [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 81,854 74,841
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 74,220 64,268
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 2,672 10,573
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 4,962 0
Equity Securities Other Than Non-redeemable Preferred Stock [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 323,877 147,859
Equity Securities Other Than Non-redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 323,877 147,859
Equity Securities Other Than Non-redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Equity Securities Other Than Non-redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Securities Pledged as Collateral [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure   17,002
Securities Pledged as Collateral [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure   1,323
Securities Pledged as Collateral [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure   15,679
Securities Pledged as Collateral [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure   0
Other [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 9,142 11,951
Other [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 9,142 11,951
Other [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Other [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Interest Rate Swap [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 9,904 104,972
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 3,828 196
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 0 0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 9,904 104,972
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 3,828 196
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 0 0
Foreign Exchange Forward [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 2,554 1,017
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 12,772 2,105
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 0 0
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 2,554 1,017
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 12,772 2,105
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 0 0
Consumer Price Index Swap [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure (309) 1,446
Consumer Price Index Swap [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Consumer Price Index Swap [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure (309) 1,446
Consumer Price Index Swap [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Credit Default Swap [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 7,926 (1,741)
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure (356) 1,953
Credit Default Swap [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 0 0
Credit Default Swap [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 7,926 (1,741)
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure (356) 1,953
Credit Default Swap [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 0 0
Equity Option [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 33,869 62,514
Equity Option [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Equity Option [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 33,869 62,514
Equity Option [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0 0
Currency Swap [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 21,283  
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure (33) 27,398
Currency Swap [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0  
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 0 0
Currency Swap [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 21,283  
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure (33) 27,398
Currency Swap [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0  
Liabilities, Fair Value Disclosure [Abstract]    
Other Liabilities, Fair Value Disclosure 0 0
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 138,892  
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 132,643  
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 6,249  
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Other Assets, Fair Value Disclosure 0  
Corporate Debt Securities [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 12,110,755 12,380,071
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 68,934 43,544
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 10,696,532 10,667,964
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 1,345,289 1,668,563
Canadian Provincial Governments [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 3,381,025 4,049,334
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 0 0
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 3,381,025 4,049,334
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 0 0
Residential Mortgage Backed Securities [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 989,643 1,042,064
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 0 0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 836,138 948,133
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 153,505 93,931
Asset-backed Securities [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 894,832 691,555
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 0 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 422,984 459,164
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 471,848 232,391
Commercial Mortgage Backed Securities [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 1,388,946 1,698,903
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 0 0
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 1,287,161 1,531,897
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 101,785 167,006
US Treasury and Government [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 501,351 265,190
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 396,092 192,780
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 64,340 67,872
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 40,919 4,538
US States and Political Subdivisions Debt Securities [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 320,820 302,498
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 0 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 277,044 259,286
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 43,776 43,212
Foreign Government Debt Securities [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 1,886,764 1,861,999
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 304,487 297,025
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale 1,544,280 1,536,694
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Fixed maturity securities available-for-sale $ 37,997 $ 28,280