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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, 2019	Dec. 31, 2018
Assets
Derivative instruments	$ 755,866	$ 205,149
Fair Value, Measurements, Recurring
Assets
Derivative instruments	755,866	205,149
Cash and cash equivalents	1,115,890	344,396
Counterparty collateral	114,137	33,101
Assets	50,030,707	46,514,761
Liabilities
Fixed index annuities - embedded derivatives	8,876,055	8,165,405
Liabilities	8,876,150
Fair Value, Measurements, Recurring | Interest Rate Caps
Assets
Interest rate derivative assets	268	597
Fair Value, Measurements, Recurring | Interest Rate Swap
Assets
Interest rate derivative assets		354
Liabilities
Interest rate derivative liabilities	95
Fair Value, Measurements, Recurring | United States Government Full Faith and Credit
Assets
Fixed maturity securities, available for sale	11,701	11,652
Fair Value, Measurements, Recurring | United States Government Sponsored Agencies
Assets
Fixed maturity securities, available for sale	1,187,340	1,138,529
Fair Value, Measurements, Recurring | United States Municipalities, States and Territories
Assets
Fixed maturity securities, available for sale	4,174,846	4,126,267
Fair Value, Measurements, Recurring | Foreign Government Obligations
Assets
Fixed maturity securities, available for sale	235,542	230,274
Fair Value, Measurements, Recurring | Corporate Securities
Assets
Fixed maturity securities, available for sale	30,014,197	28,371,514
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	1,201,332	1,202,159
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	5,543,512	5,379,003
Fair Value, Measurements, Recurring | Other Asset Backed Securities
Assets
Fixed maturity securities, available for sale	5,668,637	5,464,329
Fair Value, Measurements, Recurring | Equity Securities
Assets
Fixed maturity securities, available for sale	7,439	7,437
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Assets
Derivative instruments	0	0
Cash and cash equivalents	1,115,890	344,396
Counterparty collateral	0	0
Assets	1,121,865	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	5,967	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	8	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	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Derivative instruments	755,866	205,149
Cash and cash equivalents	0	0
Counterparty collateral	114,137	33,101
Assets	48,908,842	46,164,458
Liabilities
Fixed index annuities - embedded derivatives	0	0
Liabilities	95
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Caps
Assets
Interest rate derivative assets	268	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	95
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Full Faith and Credit
Assets
Fixed maturity securities, available for sale	5,734	5,752
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Sponsored Agencies
Assets
Fixed maturity securities, available for sale	1,187,340	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	4,174,846	4,126,267
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Government Obligations
Assets
Fixed maturity securities, available for sale	235,542	230,274
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Securities
Assets
Fixed maturity securities, available for sale	30,014,189	28,371,507
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	1,201,332	1,202,159
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Backed Securities
Assets
Fixed maturity securities, available for sale	5,543,512	5,379,003
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Asset Backed Securities
Assets
Fixed maturity securities, available for sale	5,668,637	5,464,329
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity Securities
Assets
Fixed maturity securities, available for sale	7,439	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	0
Assets	0	0
Liabilities
Fixed index annuities - embedded derivatives	8,876,055	8,165,405
Liabilities	8,876,055
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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