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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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