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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 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Derivative instruments | $ 1,355,989 | $ 205,149
Fair Value, Measurements, Recurring |  |
Assets |  |
Derivative instruments | 1,355,989 | 205,149
Cash and cash equivalents | 2,293,392 | 344,396
Counterparty collateral |  | 33,101
Assets | 55,229,877 | 46,507,324
Liabilities |  |
Fixed index annuities - embedded derivatives | 9,624,395 | 8,165,405
Fair Value, Measurements, Recurring | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 6 | 597
Fair Value, Measurements, Recurring | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets |  | 354
Fair Value, Measurements, Recurring | United States Government Full Faith and Credit |  |
Assets |  |
Available for sale securities | 161,765 | 11,652
Fair Value, Measurements, Recurring | United States Government Sponsored Agencies |  |
Assets |  |
Available for sale securities | 625,020 | 1,138,529
Fair Value, Measurements, Recurring | United States Municipalities, States and Territories |  |
Assets |  |
Available for sale securities | 4,527,671 | 4,126,267
Fair Value, Measurements, Recurring | Foreign Government Obligations |  |
Assets |  |
Available for sale securities | 205,096 | 230,274
Fair Value, Measurements, Recurring | Corporate Securities |  |
Assets |  |
Available for sale securities | 32,536,839 | 28,371,514
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 1,575,664 | 1,202,159
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 5,786,279 | 5,379,003
Fair Value, Measurements, Recurring | Other Asset Backed Securities |  |
Assets |  |
Available for sale securities | 6,162,156 | 5,464,329
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Derivative instruments | 0 | 0
Cash and cash equivalents | 2,293,392 | 344,396
Counterparty collateral |  | 0
Assets | 2,449,341 | 350,303
Liabilities |  |
Fixed index annuities - embedded derivatives | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Full Faith and Credit |  |
Assets |  |
Available for sale securities | 155,945 | 5,900
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Sponsored Agencies |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Municipalities, States and Territories |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Foreign Government Obligations |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Corporate Securities |  |
Assets |  |
Available for sale securities | 4 | 7
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Residential Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Commercial Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other Asset Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Derivative instruments | 1,355,989 | 205,149
Cash and cash equivalents | 0 | 0
Counterparty collateral |  | 33,101
Assets | 52,780,536 | 46,157,021
Liabilities |  |
Fixed index annuities - embedded derivatives | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 6 | 597
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets |  | 354
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Full Faith and Credit |  |
Assets |  |
Available for sale securities | 5,820 | 5,752
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Sponsored Agencies |  |
Assets |  |
Available for sale securities | 625,020 | 1,138,529
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Municipalities, States and Territories |  |
Assets |  |
Available for sale securities | 4,527,671 | 4,126,267
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Government Obligations |  |
Assets |  |
Available for sale securities | 205,096 | 230,274
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Securities |  |
Assets |  |
Available for sale securities | 32,536,835 | 28,371,507
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 1,575,664 | 1,202,159
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 5,786,279 | 5,379,003
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Asset Backed Securities |  |
Assets |  |
Available for sale securities | 6,162,156 | 5,464,329
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Derivative instruments | 0 | 0
Cash and cash equivalents | 0 | 0
Counterparty collateral |  | 0
Assets | 0 | 0
Liabilities |  |
Fixed index annuities - embedded derivatives | 9,624,395 | 8,165,405
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest Rate Swap |  |
Assets |  |
Interest rate derivative assets |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Government Full Faith and Credit |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Government Sponsored Agencies |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Municipalities, States and Territories |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign Government Obligations |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial Mortgage Backed Securities |  |
Assets |  |
Available for sale securities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other Asset Backed Securities |  |
Assets |  |
Available for sale securities | $ 0 | $ 0

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