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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, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Derivative instruments | $ 1,509,892 | $ 1,310,954
Liabilities |  |
Equity method investments, fair value | 180,100 | 179,700
COLI, fair value | 374,900 | 373,600
Fair Value, Measurements, Recurring |  |
Assets |  |
Derivative instruments | 1,509,892 | 1,310,954
Cash and cash equivalents | 11,087,125 | 9,095,522
Assets | 58,639,910 | 57,945,369
Liabilities |  |
Fixed index annuities - embedded derivatives | 7,680,951 | 7,938,281
Fair Value, Measurements, Recurring | United States Government Full Faith and Credit |  |
Assets |  |
Investments | 38,727 | 39,771
Fair Value, Measurements, Recurring | United States Government Sponsored Agencies |  |
Assets |  |
Investments | 1,027,441 | 1,039,551
Fair Value, Measurements, Recurring | United States Municipalities, States and Territories |  |
Assets |  |
Investments | 3,655,844 | 3,776,131
Fair Value, Measurements, Recurring | Foreign Government Obligations |  |
Assets |  |
Investments | 193,944 | 202,706
Fair Value, Measurements, Recurring | Corporate Securities |  |
Assets |  |
Investments | 29,890,265 | 31,156,827
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities |  |
Assets |  |
Investments | 1,346,473 | 1,512,831
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities |  |
Assets |  |
Investments | 4,177,242 | 4,261,227
Fair Value, Measurements, Recurring | Other Asset Backed Securities |  |
Assets |  |
Investments | 5,360,405 | 5,549,849
Fair Value, Measurements, Recurring | Equity Securities |  |
Assets |  |
Investments | 352,552 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Derivative instruments | 0 | 0
Cash and cash equivalents | 11,087,125 | 9,095,522
Assets | 11,470,364 | 9,129,470
Liabilities |  |
Fixed index annuities - embedded derivatives | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Full Faith and Credit |  |
Assets |  |
Investments | 33,228 | 33,940
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 | 11 | 8
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 | Quoted Prices in Active Markets (Level 1) | Equity Securities |  |
Assets |  |
Investments | 350,000 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Derivative instruments | 1,509,892 | 1,310,954
Cash and cash equivalents | 0 | 0
Assets | 47,169,546 | 48,815,899
Liabilities |  |
Fixed index annuities - embedded derivatives | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Full Faith and Credit |  |
Assets |  |
Investments | 5,499 | 5,831
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Sponsored Agencies |  |
Assets |  |
Investments | 1,027,441 | 1,039,551
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Municipalities, States and Territories |  |
Assets |  |
Investments | 3,655,844 | 3,776,131
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Government Obligations |  |
Assets |  |
Investments | 193,944 | 202,706
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Securities |  |
Assets |  |
Investments | 29,890,254 | 31,156,819
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Backed Securities |  |
Assets |  |
Investments | 1,346,473 | 1,512,831
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Backed Securities |  |
Assets |  |
Investments | 4,177,242 | 4,261,227
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Asset Backed Securities |  |
Assets |  |
Investments | 5,360,405 | 5,549,849
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity Securities |  |
Assets |  |
Investments | 2,552 |
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 | 7,680,951 | 7,938,281
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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities |  |
Assets |  |
Investments | $ 0 |

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