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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	Jun. 30, 2019	Dec. 31, 2018
Assets
Derivative instruments	$ 888,208	$ 205,149
Fair Value, Measurements, Recurring
Assets
Derivative instruments	888,208	205,149
Cash and cash equivalents	1,215,967	344,396
Counterparty collateral		33,101
Assets	52,534,848	46,514,761
Liabilities
Fixed index annuities - embedded derivatives	9,281,117	8,165,405
Liabilities	9,281,998
Fair Value, Measurements, Recurring | Interest Rate Caps
Assets
Interest rate derivative assets	59	597
Fair Value, Measurements, Recurring | Interest Rate Swap
Assets
Interest rate derivative assets		354
Liabilities
Interest rate derivative liabilities	881
Fair Value, Measurements, Recurring | United States Government Full Faith and Credit
Assets
Fixed maturity securities, available for sale	12,023	11,652
Fair Value, Measurements, Recurring | United States Government Sponsored Agencies
Assets
Fixed maturity securities, available for sale	1,214,609	1,138,529
Fair Value, Measurements, Recurring | United States Municipalities, States and Territories
Assets
Fixed maturity securities, available for sale	4,299,962	4,126,267
Fair Value, Measurements, Recurring | Foreign Government Obligations
Assets
Fixed maturity securities, available for sale	233,095	230,274
Fair Value, Measurements, Recurring | Corporate Securities
Assets
Fixed maturity securities, available for sale	31,312,263	28,371,514
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	1,338,946	1,202,159
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	5,673,990	5,379,003
Fair Value, Measurements, Recurring | Other Asset Backed Securities
Assets
Fixed maturity securities, available for sale	6,086,415	5,464,329
Fair Value, Measurements, Recurring | Equity Securities
Assets
Fixed maturity securities, available for sale	259,311	7,437
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Assets
Derivative instruments	0	0
Cash and cash equivalents	1,215,967	344,396
Counterparty collateral		0
Assets	1,473,920	350,303
Liabilities
Fixed index annuities - embedded derivatives	0	0
Liabilities	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
Liabilities
Interest rate derivative liabilities	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Full Faith and Credit
Assets
Fixed maturity securities, available for sale	6,080	5,900
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Sponsored Agencies
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Municipalities, States and Territories
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Foreign Government Obligations
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Corporate Securities
Assets
Fixed maturity securities, available for sale	3	7
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Residential Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Commercial Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other Asset Backed Securities
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Equity Securities
Assets
Fixed maturity securities, available for sale	251,870	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Derivative instruments	888,208	205,149
Cash and cash equivalents	0	0
Counterparty collateral		33,101
Assets	51,060,928	46,164,458
Liabilities
Fixed index annuities - embedded derivatives	0	0
Liabilities	881
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Caps
Assets
Interest rate derivative assets	59	597
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Swap
Assets
Interest rate derivative assets		354
Liabilities
Interest rate derivative liabilities	881
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Full Faith and Credit
Assets
Fixed maturity securities, available for sale	5,943	5,752
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Sponsored Agencies
Assets
Fixed maturity securities, available for sale	1,214,609	1,138,529
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Municipalities, States and Territories
Assets
Fixed maturity securities, available for sale	4,299,962	4,126,267
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Government Obligations
Assets
Fixed maturity securities, available for sale	233,095	230,274
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Securities
Assets
Fixed maturity securities, available for sale	31,312,260	28,371,507
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	1,338,946	1,202,159
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	5,673,990	5,379,003
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Asset Backed Securities
Assets
Fixed maturity securities, available for sale	6,086,415	5,464,329
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity Securities
Assets
Fixed maturity securities, available for sale	7,441	7,437
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	9,281,117	8,165,405
Liabilities	9,281,117
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
Liabilities
Interest rate derivative liabilities	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Government Full Faith and Credit
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Government Sponsored Agencies
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Municipalities, States and Territories
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign Government Obligations
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate Securities
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other Asset Backed Securities
Assets
Fixed maturity securities, available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities
Assets
Fixed maturity securities, available for sale	$ 0	$ 0

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