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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, 2018	Dec. 31, 2017
Assets
Derivative instruments	$ 205,149	$ 1,568,380
Fair Value, Measurements, Recurring
Assets
Derivative instruments	205,149	1,568,380
Cash and cash equivalents	344,396	1,434,045
Counterparty collateral	33,101	186,108
Assets	46,514,761	48,854,366
Liabilities
Fixed index annuities - embedded derivatives	8,165,405	8,790,427
Liabilities		8,791,216
Fair Value, Measurements, Recurring | Interest Rate Caps
Assets
Interest rate derivative assets	597	415
Fair Value, Measurements, Recurring | Interest Rate Swap
Assets
Interest rate derivative assets	354
Liabilities
Interest rate derivative liabilities		789
Fair Value, Measurements, Recurring | United States Government Full Faith and Credit
Assets
Available for sale securities	11,652	11,876
Fair Value, Measurements, Recurring | United States Government Sponsored Agencies
Assets
Available for sale securities	1,138,529	1,305,017
Fair Value, Measurements, Recurring | United States Municipalities, States and Territories
Assets
Available for sale securities	4,126,267	4,166,812
Fair Value, Measurements, Recurring | Foreign Government Obligations
Assets
Available for sale securities	230,274	239,360
Fair Value, Measurements, Recurring | Corporate Securities
Assets
Available for sale securities	28,371,514	29,878,971
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities
Assets
Available for sale securities	1,202,159	1,105,567
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities
Assets
Available for sale securities	5,379,003	5,544,850
Fair Value, Measurements, Recurring | Other Asset Backed Securities
Assets
Available for sale securities	5,464,329	3,120,536
Fair Value, Measurements, Recurring | Equity Securities
Assets
Available for sale securities	7,437	292,429
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Assets
Derivative instruments	0	0
Cash and cash equivalents	344,396	1,434,045
Counterparty collateral	0	0
Assets	350,303	1,724,690
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
Available for sale securities	5,900	5,640
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	7	5
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 | Quoted Prices in Active Markets (Level 1) | Equity Securities
Assets
Available for sale securities	0	285,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Derivative instruments	205,149	1,568,380
Cash and cash equivalents	0	0
Counterparty collateral	33,101	186,108
Assets	46,164,458	47,129,676
Liabilities
Fixed index annuities - embedded derivatives	0	0
Liabilities		789
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Caps
Assets
Interest rate derivative assets	597	415
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Swap
Assets
Interest rate derivative assets	354
Liabilities
Interest rate derivative liabilities		789
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Full Faith and Credit
Assets
Available for sale securities	5,752	6,236
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Sponsored Agencies
Assets
Available for sale securities	1,138,529	1,305,017
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Municipalities, States and Territories
Assets
Available for sale securities	4,126,267	4,166,812
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Government Obligations
Assets
Available for sale securities	230,274	239,360
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Securities
Assets
Available for sale securities	28,371,507	29,878,966
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Backed Securities
Assets
Available for sale securities	1,202,159	1,105,567
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Backed Securities
Assets
Available for sale securities	5,379,003	5,544,850
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Asset Backed Securities
Assets
Available for sale securities	5,464,329	3,120,536
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity Securities
Assets
Available for sale securities	7,437	7,429
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	8,165,405	8,790,427
Liabilities		8,790,427
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
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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities
Assets
Available for sale securities	$ 0	$ 0

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