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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
Mar. 31, 2017
Dec. 31, 2016
Fixed Maturity Securities [Member]    
Assets    
Available for sale securities $ 42,105,366 $ 41,060,494
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]    
Assets    
Available for sale securities 11,672 11,805
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]    
Assets    
Available for sale securities 1,340,788 1,344,787
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]    
Assets    
Available for sale securities 3,989,302 3,926,950
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]    
Assets    
Available for sale securities 238,398 236,341
Fixed Maturity Securities [Member] | Corporate Securities [Member]    
Assets    
Available for sale securities 28,160,620 27,114,418
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 1,200,040 1,254,835
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 5,383,942 5,365,235
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]    
Assets    
Available for sale securities 1,780,604 1,806,123
Equity Securities [Member]    
Assets    
Available for sale securities 7,990 8,000
Fair Value, Measurements, Recurring [Member]    
Assets    
Derivative assets 1,033,552 830,519
Cash and cash equivalents 1,172,748 791,266
Counterparty collateral 143,229 145,693
Assets 44,463,689 42,837,054
Liabilities    
Fixed index annuities - embedded derivatives 7,051,000 6,563,288
Liabilities 7,052,729 6,565,401
Fair Value, Measurements, Recurring [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 804 1,082
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 1,729 2,113
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]    
Assets    
Available for sale securities 11,672 11,805
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]    
Assets    
Available for sale securities 1,340,788 1,344,787
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]    
Assets    
Available for sale securities 3,989,302 3,926,950
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]    
Assets    
Available for sale securities 238,398 236,341
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Corporate Securities [Member]    
Assets    
Available for sale securities 28,160,620 27,114,418
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 1,200,040 1,254,835
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Assets    
Available for sale securities 5,383,942 5,365,235
Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]    
Assets    
Available for sale securities 1,780,604 1,806,123
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 7,990 8,000
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Derivative assets 0 0
Cash and cash equivalents 1,172,748 791,266
Counterparty collateral 0 0
Assets 1,178,141 796,653
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 5,381 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 12 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 1,033,552 830,519
Cash and cash equivalents 0 0
Counterparty collateral 143,229 145,693
Assets 43,285,548 42,040,401
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 1,729 2,113
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 804 1,082
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 1,729 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 6,291 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 1,340,788 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 3,989,302 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 238,398 236,341
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Maturity Securities [Member] | Corporate Securities [Member]    
Assets    
Available for sale securities 28,160,608 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 1,200,040 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 5,383,942 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 1,780,604 1,806,123
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 7,990 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 7,051,000 6,563,288
Liabilities 7,051,000 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