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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, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Derivative instruments | $ 207,265 | $ 1,355,989
Fair Value, Measurements, Recurring |  |
Assets |  |
Derivative instruments | 207,265 | 1,355,989
Cash and cash equivalents | 1,833,099 | 2,293,392
Assets | 49,745,231 | 55,229,877
Liabilities |  |
Fixed index annuities - embedded derivatives | 8,451,482 | 9,624,395
Fair Value, Measurements, Recurring | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets |  | 6
Fair Value, Measurements, Recurring | United States Government Full Faith and Credit |  |
Assets |  |
Investments | 39,248 | 161,765
Fair Value, Measurements, Recurring | United States Government Sponsored Agencies |  |
Assets |  |
Investments | 338,561 | 625,020
Fair Value, Measurements, Recurring | United States Municipalities, States and Territories |  |
Assets |  |
Investments | 3,765,163 | 4,527,671
Fair Value, Measurements, Recurring | Foreign Government Obligations |  |
Assets |  |
Investments | 198,396 | 205,096
Fair Value, Measurements, Recurring | Corporate Securities |  |
Assets |  |
Investments | 31,135,319 | 32,536,839
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities |  |
Assets |  |
Investments | 1,765,033 | 1,575,664
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities |  |
Assets |  |
Investments | 5,296,112 | 5,786,279
Fair Value, Measurements, Recurring | Other Asset Backed Securities |  |
Assets |  |
Investments | 5,167,035 | 6,162,156
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Derivative instruments | 0 | 0
Cash and cash equivalents | 1,833,099 | 2,293,392
Assets | 1,866,070 | 2,449,341
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
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Full Faith and Credit |  |
Assets |  |
Investments | 32,963 | 155,945
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Sponsored Agencies |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Municipalities, States and Territories |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Foreign Government Obligations |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Corporate Securities |  |
Assets |  |
Investments | 8 | 4
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Residential Mortgage Backed Securities |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Commercial Mortgage Backed Securities |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other Asset Backed Securities |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Derivative instruments | 207,265 | 1,355,989
Cash and cash equivalents | 0 | 0
Assets | 47,879,161 | 52,780,536
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
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Full Faith and Credit |  |
Assets |  |
Investments | 6,285 | 5,820
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Sponsored Agencies |  |
Assets |  |
Investments | 338,561 | 625,020
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Municipalities, States and Territories |  |
Assets |  |
Investments | 3,765,163 | 4,527,671
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Government Obligations |  |
Assets |  |
Investments | 198,396 | 205,096
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Securities |  |
Assets |  |
Investments | 31,135,311 | 32,536,835
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Backed Securities |  |
Assets |  |
Investments | 1,765,033 | 1,575,664
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Backed Securities |  |
Assets |  |
Investments | 5,296,112 | 5,786,279
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Asset Backed Securities |  |
Assets |  |
Investments | 5,167,035 | 6,162,156
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Derivative instruments | 0 | 0
Cash and cash equivalents | 0 | 0
Assets | 0 | 0
Liabilities |  |
Fixed index annuities - embedded derivatives | 8,451,482 | 9,624,395
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest Rate Caps |  |
Assets |  |
Interest rate derivative assets |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Government Full Faith and Credit |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Government Sponsored Agencies |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Municipalities, States and Territories |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign Government Obligations |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate Securities |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential Mortgage Backed Securities |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial Mortgage Backed Securities |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other Asset Backed Securities |  |
Assets |  |
Investments | $ 0 | $ 0

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