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Fair Values of Financial Instruments (Assets and Liabilities Measured on a Recurring Basis by Fair Value Hierarchy) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fixed Maturity Securities [Member]    
Assets    
Available for sale securities $ 43,893,785 $ 41,060,494
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]    
Assets    
Available for sale securities 12,174 11,805
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]    
Assets    
Available for sale securities 1,340,839 1,344,787
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]    
Assets    
Available for sale securities 4,137,714 3,926,950
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]    
Assets    
Available for sale securities 238,869 236,341
Fixed Maturity Securities [Member] | Corporate Securities [Member]    
Assets    
Available for sale securities 29,287,071 27,114,418
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 1,181,850 1,254,835
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 5,540,383 5,365,235
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]    
Assets    
Available for sale securities 2,154,885 1,806,123
Equity Securities [Member]    
Assets    
Available for sale securities 7,982 8,000
Fair Value, Measurements, Recurring [Member]    
Assets    
Derivative assets 1,086,624 830,519
Cash and cash equivalents 1,574,913 791,266
Counterparty collateral 144,283 145,693
Assets 46,708,055 42,837,054
Liabilities    
Fixed index annuities - embedded derivatives 7,552,365 6,563,288
Liabilities 7,554,366 6,565,401
Fair Value, Measurements, Recurring [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 468 1,082
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 2,001 2,113
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]    
Assets    
Available for sale securities 12,174 11,805
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]    
Assets    
Available for sale securities 1,340,839 1,344,787
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]    
Assets    
Available for sale securities 4,137,714 3,926,950
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]    
Assets    
Available for sale securities 238,869 236,341
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Corporate Securities [Member]    
Assets    
Available for sale securities 29,287,071 27,114,418
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 1,181,850 1,254,835
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 5,540,383 5,365,235
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]    
Assets    
Available for sale securities 2,154,885 1,806,123
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 7,982 8,000
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Derivative assets 0 0
Cash and cash equivalents 1,574,913 791,266
Counterparty collateral 0 0
Assets 1,580,726 796,653
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]    
Assets    
Available for sale securities 5,807 5,381
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Corporate Securities [Member]    
Assets    
Available for sale securities 6 6
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]    
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Derivative assets 1,086,624 830,519
Cash and cash equivalents 0 0
Counterparty collateral 144,283 145,693
Assets 45,127,329 42,040,401
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 2,001 2,113
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 468 1,082
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 2,001 2,113
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]    
Assets    
Available for sale securities 6,367 6,424
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]    
Assets    
Available for sale securities 1,340,839 1,344,787
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]    
Assets    
Available for sale securities 4,137,714 3,926,950
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]    
Assets    
Available for sale securities 238,869 236,341
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Corporate Securities [Member]    
Assets    
Available for sale securities 29,287,065 27,114,412
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 1,181,850 1,254,835
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 5,540,383 5,365,235
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]    
Assets    
Available for sale securities 2,154,885 1,806,123
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 7,982 8,000
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [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 7,552,365 6,563,288
Liabilities 7,552,365 6,563,288
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Corporate Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]    
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Assets    
Available for sale securities $ 0 $ 0