Fair Value Quantitative Information about Level 3 Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - Significant unobservable inputs (Level 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 36,050	$ 100,414
Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	6,588	19,178
Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	12,780	55,866
Asset-backed Securities, Securitized Loans and Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	6,000
Non-redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	6,927	6,862
Asset fair value by technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	32,295	81,906
Index Product Embedded Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Future policy benefits - indexed product embedded derivatives	$ 76,346	$ 40,028
Minimum | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	0.0211	0.0123
Minimum | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0118	0.0145
Minimum | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Asset-backed Securities, Securitized Loans and Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0215
Minimum | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Non-redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0272	0.0436
Minimum | Measurement Input, Entity Credit Risk | Valuation Technique, Discounted Cash Flow | Index Product Embedded Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.004	0.0055
Minimum | Measurement Input, Risk Margin | Valuation Technique, Discounted Cash Flow | Index Product Embedded Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	0.0015	0.0015
Maximum | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0585	0.07
Maximum | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0222	0.0355
Maximum | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Asset-backed Securities, Securitized Loans and Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0230
Maximum | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Non-redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0272	0.0436
Maximum | Measurement Input, Entity Credit Risk | Valuation Technique, Discounted Cash Flow | Index Product Embedded Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0135	0.018
Maximum | Measurement Input, Risk Margin | Valuation Technique, Discounted Cash Flow | Index Product Embedded Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	0.004	0.004
Weighted Average | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0433	0.0401
Weighted Average | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0192	0.0258
Weighted Average | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Asset-backed Securities, Securitized Loans and Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0223
Weighted Average | Measurement Input, Credit Spread | Valuation Technique, Discounted Cash Flow | Non-redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.0272	0.0436
Weighted Average | Measurement Input, Entity Credit Risk | Valuation Technique, Discounted Cash Flow | Index Product Embedded Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	.008	.0125
Weighted Average | Measurement Input, Risk Margin | Valuation Technique, Discounted Cash Flow | Index Product Embedded Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Input range and weighted average	0.0025	0.0025