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Fair Values of Financial Instruments (Assets and Liabilities Measured on a Recurring Basis by Fair Value Hierarchy) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets    
Derivative assets $ 830,519 $ 337,256
Cash and cash equivalents 791,266 397,749
Counterparty collateral 145,693 82,312
Assets 42,837,054 37,248,394
Liabilities    
Fixed index annuities - embedded derivatives 6,563,288 5,983,622
Liabilities 6,565,401 5,986,761
Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 1,082 1,410
Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 2,113 3,139
Other Investments: Equity Securities, Available For Sale [Member]    
Assets    
Available for sale securities 8,000 7,828
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 11,805 471,256
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,344,787 1,398,611
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 3,926,950 3,755,367
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 232,233 212,565
Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 27,118,526 23,802,394
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,254,835 1,462,072
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 5,365,235 4,174,396
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,806,123 1,145,178
Quoted Prices in Active Markets (Level 1) [Member]    
Assets    
Derivative assets 0 0
Cash and cash equivalents 791,266 397,749
Counterparty collateral 0 0
Assets 796,653 836,468
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Other Investments: Equity Securities, Available For Sale [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 5,381 438,598
Quoted Prices in Active Markets (Level 1) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 6 121
Quoted Prices in Active Markets (Level 1) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Assets    
Derivative assets 830,519 337,256
Cash and cash equivalents 0 0
Counterparty collateral 145,693 82,312
Assets 42,040,401 36,411,926
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 2,113 3,139
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 1,082 1,410
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 2,113 3,139
Significant Other Observable Inputs (Level 2) [Member] | Other Investments: Equity Securities, Available For Sale [Member]    
Assets    
Available for sale securities 8,000 7,828
Significant Other Observable Inputs (Level 2) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 6,424 32,658
Significant Other Observable Inputs (Level 2) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,344,787 1,398,611
Significant Other Observable Inputs (Level 2) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 3,926,950 3,755,367
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 232,233 212,565
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 27,118,520 23,802,273
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,254,835 1,462,072
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 5,365,235 4,174,396
Significant Other Observable Inputs (Level 2) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 1,806,123 1,145,178
Significant Unobservable Inputs (Level 3) [Member]    
Assets    
Derivative assets 0 0
Cash and cash equivalents 0 0
Counterparty collateral 0 0
Assets 0 0
Liabilities    
Fixed index annuities - embedded derivatives 6,563,288 5,983,622
Liabilities 6,563,288 5,983,622
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 0 0
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Other Investments: Equity Securities, Available For Sale [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities $ 0 $ 0