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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Assets    
Fixed maturities available-for-sale $ 16,281,559 $ 18,188,344
Short-term investments available-for-sale 1,997,680 266,332
Collateral under securities lending agreements 64,116 142,022
Collateral under derivative counterparty collateral agreements 222  
Total derivative instruments 35,796 32,418
Separate account assets 25,369,168 24,605,526
Liabilities    
Payable under securities lending agreements 64,116 142,022
Separate account liabilities 25,369,168 24,605,526
Derivative instruments designated as hedges
    
Assets    
Total derivative instruments 29,511 31,014
Derivative instruments not designated as hedges
    
Assets    
Total derivative instruments 6,285 1,404
Derivative instruments not designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 749 1,062
Derivative instruments not designated as hedges | Interest rate swaptions
    
Assets    
Total derivative instruments 849 342
Derivative instruments not designated as hedges | Other forward contracts
    
Assets    
Total derivative instruments 4,687  
U.S. government direct obligations and U.S. agencies
    
Assets    
Fixed maturities available-for-sale 972,484 2,834,074
Obligations of U.S. states and their subdivisions
    
Assets    
Fixed maturities available-for-sale 1,959,093 2,018,505
Foreign government securities
    
Assets    
Fixed maturities available-for-sale 2,673  
Corporate debt securities
    
Assets    
Fixed maturities available-for-sale 10,543,055 10,374,091
Asset-backed securities
    
Assets    
Fixed maturities available-for-sale 1,830,603 1,861,139
Residential mortgage-backed securities
    
Assets    
Fixed maturities available-for-sale 347,680 425,585
Commercial mortgage-backed securities
    
Assets    
Fixed maturities available-for-sale 613,389 662,955
Collateralized debt obligations
    
Assets    
Fixed maturities available-for-sale 12,582 11,995
Recurring basis | Quoted prices in active markets for identical assets (Level 1)
    
Assets    
Short-term investments available-for-sale 189,222 19,459
Collateral under securities lending agreements 64,116 142,022
Collateral under derivative counterparty collateral agreements 83,160 54,400
Separate account assets 13,123,478 12,171,024
Total assets 13,459,976 12,386,905
Liabilities    
Payable under securities lending agreements 64,116 142,022
Separate account liabilities 34 14
Total liabilities 64,150 142,036
Recurring basis | Significant other observable inputs (Level 2)
    
Assets    
Fixed maturities available-for-sale 16,018,963 17,920,952
Fixed maturities held for trading 198,926 367,600
Short-term investments available-for-sale 1,808,458 246,873
Total derivative instruments 35,796 32,418
Separate account assets 12,245,690 12,434,502
Total assets 30,307,833 31,002,345
Liabilities    
Total derivative instruments 147,238 88,158
Separate account liabilities 188,857 352,653
Total liabilities 336,095 440,811
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 23,501 26,371
Liabilities    
Total derivative instruments 141 1,649
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments designated as hedges | Cross-currency swaps
    
Assets    
Total derivative instruments 6,010 4,643
Liabilities    
Total derivative instruments 109,591 85,752
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments not designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 749 1,062
Liabilities    
Total derivative instruments 1,759 757
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments not designated as hedges | Interest rate swaptions
    
Assets    
Total derivative instruments 849 342
Recurring basis | Significant other observable inputs (Level 2) | Derivative instruments not designated as hedges | Other forward contracts
    
Assets    
Total derivative instruments 4,687  
Liabilities    
Total derivative instruments 35,747  
Recurring basis | Significant other observable inputs (Level 2) | U.S. government direct obligations and U.S. agencies
    
Assets    
Fixed maturities available-for-sale 972,484 2,834,074
Fixed maturities held for trading 98,397 263,634
Recurring basis | Significant other observable inputs (Level 2) | Obligations of U.S. states and their subdivisions
    
Assets    
Fixed maturities available-for-sale 1,959,093 2,018,505
Recurring basis | Significant other observable inputs (Level 2) | Foreign government securities
    
Assets    
Fixed maturities available-for-sale 2,673  
Recurring basis | Significant other observable inputs (Level 2) | Corporate debt securities
    
Assets    
Fixed maturities available-for-sale 10,541,259 10,372,269
Fixed maturities held for trading 58,842 61,336
Recurring basis | Significant other observable inputs (Level 2) | Asset-backed securities
    
Assets    
Fixed maturities available-for-sale 1,569,835 1,595,601
Fixed maturities held for trading 41,687 42,630
Recurring basis | Significant other observable inputs (Level 2) | Residential mortgage-backed securities
    
Assets    
Fixed maturities available-for-sale 347,680 425,585
Recurring basis | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities
    
Assets    
Fixed maturities available-for-sale 613,389 662,955
Recurring basis | Significant other observable inputs (Level 2) | Collateralized debt obligations
    
Assets    
Fixed maturities available-for-sale 12,550 11,963
Recurring basis | Significant unobservable inputs (Level 3)
    
Assets    
Fixed maturities available-for-sale 262,596 267,392
Total assets 262,596 267,392
Recurring basis | Significant unobservable inputs (Level 3) | Corporate debt securities
    
Assets    
Fixed maturities available-for-sale 1,796 1,822
Recurring basis | Significant unobservable inputs (Level 3) | Asset-backed securities
    
Assets    
Fixed maturities available-for-sale 260,768 265,538
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 16,281,559 18,188,344
Fixed maturities held for trading 198,926 367,600
Short-term investments available-for-sale 1,997,680 266,332
Collateral under securities lending agreements 64,116 142,022
Collateral under derivative counterparty collateral agreements 83,160 54,400
Total derivative instruments 35,796 32,418
Separate account assets 25,369,168 24,605,526
Total assets 44,030,405 43,656,642
Liabilities    
Payable under securities lending agreements 64,116 142,022
Total derivative instruments 147,238 88,158
Separate account liabilities 188,891 352,667
Total liabilities 400,245 582,847
Recurring basis | Total | Derivative instruments designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 23,501 26,371
Liabilities    
Total derivative instruments 141 1,649
Recurring basis | Total | Derivative instruments designated as hedges | Cross-currency swaps
    
Assets    
Total derivative instruments 6,010 4,643
Liabilities    
Total derivative instruments 109,591 85,752
Recurring basis | Total | Derivative instruments not designated as hedges | Interest rate swaps
    
Assets    
Total derivative instruments 749 1,062
Liabilities    
Total derivative instruments 1,759 757
Recurring basis | Total | Derivative instruments not designated as hedges | Interest rate swaptions
    
Assets    
Total derivative instruments 849 342
Recurring basis | Total | Derivative instruments not designated as hedges | Other forward contracts
    
Assets    
Total derivative instruments 4,687  
Liabilities    
Total derivative instruments 35,747  
Recurring basis | Total | U.S. government direct obligations and U.S. agencies
    
Assets    
Fixed maturities available-for-sale 972,484 2,834,074
Fixed maturities held for trading 98,397 263,634
Recurring basis | Total | Obligations of U.S. states and their subdivisions
    
Assets    
Fixed maturities available-for-sale 1,959,093 2,018,505
Recurring basis | Total | Foreign government securities
    
Assets    
Fixed maturities available-for-sale 2,673  
Recurring basis | Total | Corporate debt securities
    
Assets    
Fixed maturities available-for-sale 10,543,055 10,374,091
Fixed maturities held for trading 58,842 61,336
Recurring basis | Total | Asset-backed securities
    
Assets    
Fixed maturities available-for-sale 1,830,603 1,861,139
Fixed maturities held for trading 41,687 42,630
Recurring basis | Total | Residential mortgage-backed securities
    
Assets    
Fixed maturities available-for-sale 347,680 425,585
Recurring basis | Total | Commercial mortgage-backed securities
    
Assets    
Fixed maturities available-for-sale 613,389 662,955
Recurring basis | Total | Collateralized debt obligations
    
Assets    
Fixed maturities available-for-sale $ 12,582 $ 11,995