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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 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Interest Rate Caps |  |
Assets |  |
Derivative assets | $ 1,244 | $ 415
Fixed Maturity Securities |  |
Assets |  |
Available for sale securities | 45,822,017 | 45,372,989
Fixed Maturity Securities | United States Government Full Faith and Credit |  |
Assets |  |
Available for sale securities | 10,962 | 11,876
Fixed Maturity Securities | United States Government Sponsored Agencies |  |
Assets |  |
Available for sale securities | 1,224,587 | 1,305,017
Fixed Maturity Securities | United States Municipalities, States and Territories |  |
Assets |  |
Available for sale securities | 4,142,257 | 4,166,812
Fixed Maturity Securities | Foreign Government Obligations |  |
Assets |  |
Available for sale securities | 226,500 | 239,360
Fixed Maturity Securities | Corporate Securities |  |
Assets |  |
Available for sale securities | 28,479,603 | 29,878,971
Fixed Maturity Securities | Residential Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 1,181,682 | 1,105,567
Fixed Maturity Securities | Commercial Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 5,337,368 | 5,544,850
Fixed Maturity Securities | Other Asset Backed Securities |  |
Assets |  |
Available for sale securities | 5,219,058 | 3,120,536
Equity Securities |  |
Assets |  |
Available for sale securities |  | 292,429
Fair Value, Measurements, Recurring |  |
Assets |  |
Derivative assets | 1,290,387 | 1,568,380
Cash and cash equivalents | 1,129,242 | 1,434,045
Counterparty collateral | 179,512 | 186,108
Assets | 48,630,961 | 48,854,366
Liabilities |  |
Fixed index annuities - embedded derivatives | 8,947,193 | 8,790,427
Liabilities |  | 8,791,216
Fair Value, Measurements, Recurring | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 1,244 | 415
Fair Value, Measurements, Recurring | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets | 1,125 |
Liabilities |  |
Interest rate derivative liabilities |  | 789
Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Government Full Faith and Credit |  |
Assets |  |
Available for sale securities | 10,962 | 11,876
Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Government Sponsored Agencies |  |
Assets |  |
Available for sale securities | 1,224,587 | 1,305,017
Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Municipalities, States and Territories |  |
Assets |  |
Available for sale securities | 4,142,257 | 4,166,812
Fair Value, Measurements, Recurring | Fixed Maturity Securities | Foreign Government Obligations |  |
Assets |  |
Available for sale securities | 226,500 | 239,360
Fair Value, Measurements, Recurring | Fixed Maturity Securities | Corporate Securities |  |
Assets |  |
Available for sale securities | 28,479,603 | 29,878,971
Fair Value, Measurements, Recurring | Fixed Maturity Securities | Residential Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 1,181,682 | 1,105,567
Fair Value, Measurements, Recurring | Fixed Maturity Securities | Commercial Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 5,337,368 | 5,544,850
Fair Value, Measurements, Recurring | Fixed Maturity Securities | Other Asset Backed Securities |  |
Assets |  |
Available for sale securities | 5,219,058 | 3,120,536
Fair Value, Measurements, Recurring | Equity Securities |  |
Assets |  |
Available for sale securities | 207,434 | 292,429
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Cash and cash equivalents | 1,129,242 | 1,434,045
Counterparty collateral | 0 | 0
Assets | 1,334,703 | 1,724,690
Liabilities |  |
Fixed index annuities - embedded derivatives | 0 | 0
Liabilities |  | 0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 0 | 0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets | 0 |
Liabilities |  |
Interest rate derivative liabilities |  | 0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Government Full Faith and Credit |  |
Assets |  |
Available for sale securities | 5,454 | 5,640
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Government Sponsored Agencies |  |
Assets |  |
Available for sale securities | 0 | 0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Municipalities, States and Territories |  |
Assets |  |
Available for sale securities | 0 | 0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Foreign Government Obligations |  |
Assets |  |
Available for sale securities | 0 | 0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Corporate Securities |  |
Assets |  |
Available for sale securities | 7 | 5
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Residential Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Commercial Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Other Asset Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Equity Securities |  |
Assets |  |
Available for sale securities | 200,000 | 285,000
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Assets |  |
Derivative assets | 1,290,387 | 1,568,380
Cash and cash equivalents | 0 | 0
Counterparty collateral | 179,512 | 186,108
Assets | 47,296,258 | 47,129,676
Liabilities |  |
Fixed index annuities - embedded derivatives | 0 | 0
Liabilities |  | 789
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 1,244 | 415
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets | 1,125 |
Liabilities |  |
Interest rate derivative liabilities |  | 789
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Government Full Faith and Credit |  |
Assets |  |
Available for sale securities | 5,508 | 6,236
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Government Sponsored Agencies |  |
Assets |  |
Available for sale securities | 1,224,587 | 1,305,017
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Municipalities, States and Territories |  |
Assets |  |
Available for sale securities | 4,142,257 | 4,166,812
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Foreign Government Obligations |  |
Assets |  |
Available for sale securities | 226,500 | 239,360
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Corporate Securities |  |
Assets |  |
Available for sale securities | 28,479,596 | 29,878,966
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Residential Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 1,181,682 | 1,105,567
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Commercial Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 5,337,368 | 5,544,850
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Other Asset Backed Securities |  |
Assets |  |
Available for sale securities | 5,219,058 | 3,120,536
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Equity Securities |  |
Assets |  |
Available for sale securities | 7,434 | 7,429
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Cash and cash equivalents | 0 | 0
Counterparty collateral | 0 | 0
Assets | 0 | 0
Liabilities |  |
Fixed index annuities - embedded derivatives | 8,947,193 | 8,790,427
Liabilities |  | 8,790,427
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets | 0 |
Liabilities |  |
Interest rate derivative liabilities |  | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Government Full Faith and Credit |  |
Assets |  |
Available for sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Government Sponsored Agencies |  |
Assets |  |
Available for sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | United States Municipalities, States and Territories |  |
Assets |  |
Available for sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Foreign Government Obligations |  |
Assets |  |
Available for sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Corporate Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Residential Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Commercial Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fixed Maturity Securities | Other Asset Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Equity Securities |  |
Assets |  |
Available for sale securities | $ 0 | $ 0

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