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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets    
Fixed maturities, available-for-sale $ 16,249,035 $ 18,188,344
Short-term investments available-for-sale 2,260,710 266,332
Collateral under securities lending agreements 65,711 142,022
Collateral under derivative counterparty collateral agreements 202  
Total derivative instruments 111,276 32,418
Separate account assets 25,849,162 24,605,526
Liabilities    
Payable under securities lending agreements 65,711 142,022
Separate account liabilities 25,849,162 24,605,526
Derivative instruments designated as hedges
    
Assets    
Total derivative instruments 23,922 31,014
Derivative instruments not designated as hedges
    
Assets    
Total derivative instruments 87,354 1,404
Derivative instruments not designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 955 1,062
Derivative instruments not designated as hedges | Interest rate swaptions
    
Assets    
Total derivative instruments 920 342
Derivative instruments not designated as hedges | Other forward contracts
    
Assets    
Total derivative instruments 85,479  
U.S. government direct obligations and U.S. agencies
    
Assets    
Fixed maturities, available-for-sale 926,905 2,834,074
Obligations of U.S. states and their subdivisions
    
Assets    
Fixed maturities, available-for-sale 1,971,658 2,018,505
Foreign government securities
    
Assets    
Fixed maturities, available-for-sale 2,645  
Corporate debt securities
    
Assets    
Fixed maturities, available-for-sale 10,666,754 10,374,091
Asset-backed securities
    
Assets    
Fixed maturities, available-for-sale 1,761,203 1,861,139
Residential mortgage-backed securities
    
Assets    
Fixed maturities, available-for-sale 319,246 425,585
Commercial mortgage-backed securities
    
Assets    
Fixed maturities, available-for-sale 588,390 662,955
Collateralized debt obligations
    
Assets    
Fixed maturities, available-for-sale 12,234 11,995
Recurring basis | Quoted prices in active markets for identical assets (Level 1)
    
Assets    
Short-term investments available-for-sale 257,328 19,459
Collateral under securities lending agreements 65,711 142,022
Collateral under derivative counterparty collateral agreements 132,344 54,400
Separate account assets 13,985,333 12,171,024
Total assets 14,440,716 12,386,905
Liabilities    
Payable under securities lending agreements 65,711 142,022
Separate account liabilities 8 14
Total liabilities 65,719 142,036
Recurring basis | Significant other observable inputs (Level 2)
    
Assets    
Fixed maturities, available-for-sale 15,991,862 17,920,952
Fixed maturities held for trading 272,855 367,600
Short-term investments available-for-sale 2,003,382 246,873
Total derivative instruments 111,276 32,418
Separate account assets 11,863,829 12,434,502
Total assets 30,243,204 31,002,345
Liabilities    
Total derivative instruments 186,909 88,158
Separate account liabilities 261,191 352,653
Total liabilities 448,100 440,811
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 20,777 26,371
Liabilities    
Total derivative instruments 182 1,649
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments designated as hedges | Cross-currency swaps
    
Assets    
Total derivative instruments 3,145 4,643
Liabilities    
Total derivative instruments 154,216 85,752
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments not designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 955 1,062
Liabilities    
Total derivative instruments 2,562 757
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments not designated as hedges | Interest rate swaptions
    
Assets    
Total derivative instruments 920 342
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments not designated as hedges | Other forward contracts
    
Assets    
Total derivative instruments 85,479  
Liabilities    
Total derivative instruments 29,949  
Recurring basis | Significant other observable inputs (Level 2) | U.S. government direct obligations and U.S. agencies
    
Assets    
Fixed maturities, available-for-sale 926,905 2,834,074
Fixed maturities held for trading 172,577 263,634
Recurring basis | Significant other observable inputs (Level 2) | Obligations of U.S. states and their subdivisions
    
Assets    
Fixed maturities, available-for-sale 1,971,658 2,018,505
Recurring basis | Significant other observable inputs (Level 2) | Foreign government securities
    
Assets    
Fixed maturities, available-for-sale 2,645  
Recurring basis | Significant other observable inputs (Level 2) | Corporate debt securities
    
Assets    
Fixed maturities, available-for-sale 10,664,962 10,372,269
Fixed maturities held for trading 58,979 61,336
Recurring basis | Significant other observable inputs (Level 2) | Asset-backed securities
    
Assets    
Fixed maturities, available-for-sale 1,505,854 1,595,601
Fixed maturities held for trading 41,299 42,630
Recurring basis | Significant other observable inputs (Level 2) | Residential mortgage-backed securities
    
Assets    
Fixed maturities, available-for-sale 319,246 425,585
Recurring basis | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities
    
Assets    
Fixed maturities, available-for-sale 588,390 662,955
Recurring basis | Significant other observable inputs (Level 2) | Collateralized debt obligations
    
Assets    
Fixed maturities, available-for-sale 12,202 11,963
Recurring basis | Significant unobservable inputs (Level 3)
    
Assets    
Fixed maturities, available-for-sale 257,173 267,392
Total assets 257,173 267,392
Recurring basis | Significant unobservable inputs (Level 3) | Corporate debt securities
    
Assets    
Fixed maturities, available-for-sale 1,792 1,822
Recurring basis | Significant unobservable inputs (Level 3) | Asset-backed securities
    
Assets    
Fixed maturities, available-for-sale 255,349 265,538
Recurring basis | Significant unobservable inputs (Level 3) | Collateralized debt obligations
    
Assets    
Fixed maturities, available-for-sale 32 32
Recurring basis | Total
    
Assets    
Fixed maturities, available-for-sale 16,249,035 18,188,344
Fixed maturities held for trading 272,855 367,600
Short-term investments available-for-sale 2,260,710 266,332
Collateral under securities lending agreements 65,711 142,022
Collateral under derivative counterparty collateral agreements 132,344 54,400
Total derivative instruments 111,276 32,418
Separate account assets 25,849,162 24,605,526
Total assets 44,941,093 43,656,642
Liabilities    
Payable under securities lending agreements 65,711 142,022
Total derivative instruments 186,909 88,158
Separate account liabilities 261,199 352,667
Total liabilities 513,819 582,847
Recurring basis | Total | Derivative instruments designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 20,777 26,371
Liabilities    
Total derivative instruments 182 1,649
Recurring basis | Total | Derivative instruments designated as hedges | Cross-currency swaps
    
Assets    
Total derivative instruments 3,145 4,643
Liabilities    
Total derivative instruments 154,216 85,752
Recurring basis | Total | Derivative instruments not designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 955 1,062
Liabilities    
Total derivative instruments 2,562 757
Recurring basis | Total | Derivative instruments not designated as hedges | Interest rate swaptions
    
Assets    
Total derivative instruments 920 342
Recurring basis | Total | Derivative instruments not designated as hedges | Other forward contracts
    
Assets    
Total derivative instruments 85,479  
Liabilities    
Total derivative instruments 29,949  
Recurring basis | Total | U.S. government direct obligations and U.S. agencies
    
Assets    
Fixed maturities, available-for-sale 926,905 2,834,074
Fixed maturities held for trading 172,577 263,634
Recurring basis | Total | Obligations of U.S. states and their subdivisions
    
Assets    
Fixed maturities, available-for-sale 1,971,658 2,018,505
Recurring basis | Total | Foreign government securities
    
Assets    
Fixed maturities, available-for-sale 2,645  
Recurring basis | Total | Corporate debt securities
    
Assets    
Fixed maturities, available-for-sale 10,666,754 10,374,091
Fixed maturities held for trading 58,979 61,336
Recurring basis | Total | Asset-backed securities
    
Assets    
Fixed maturities, available-for-sale 1,761,203 1,861,139
Fixed maturities held for trading 41,299 42,630
Recurring basis | Total | Residential mortgage-backed securities
    
Assets    
Fixed maturities, available-for-sale 319,246 425,585
Recurring basis | Total | Commercial mortgage-backed securities
    
Assets    
Fixed maturities, available-for-sale 588,390 662,955
Recurring basis | Total | Collateralized debt obligations
    
Assets    
Fixed maturities, available-for-sale $ 12,234 $ 11,995