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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value $ 1,953,000    
Debt Securities, Available-for-sale, Allowance for Credit Loss 1,000 $ 0 $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 30,000 31,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 109,000 106,000  
Financial assets:      
Derivative assets 26,000 28,000  
Other assets 0    
Long-term Debt 501,000 639,000  
Financial liabilities:      
Derivative liabilities 37,000 38,000  
Equity Securities Excluded From Fair Value Table 12,000 12,000  
Debt Securities, Available-for-sale, Amortized Cost 2,033,000 2,041,000  
Debt Securities, Available-for-Sale, Current 1,953,000 1,966,000  
Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 1,552,000 1,395,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 1,000 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 30,000 31,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 109,000 106,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 1,632,000 1,469,000  
Fixed Income Investments And Other Investments [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 1,917,000 1,902,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 1,000 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 30,000 31,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 109,000 106,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 1,997,000 1,977,000  
Commercial Mortgage Backed Securities [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 16,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 16,000    
Short-term Investments [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 365,000 507,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 365,000 507,000  
Asset-backed Securities [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 268,000 224,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,000 2,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 10,000 5,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 275,000 227,000  
Collateralized Debt Obligations [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 138,000 137,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3,000 4,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 140,000 141,000  
Residential Mortgage-Backed Securities [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 238,000 238,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 1,000 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 26,000 28,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 17,000 19,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 230,000 230,000  
US Government Debt Securities [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 71,000 65,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 4,000 4,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 75,000 68,000  
Debt Security, Government, Non-US [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 83,000 76,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 11,000 9,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 94,000 85,000  
Corporate Debt Securities [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 674,000 598,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 1,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 62,000 63,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 736,000 659,000  
Municipal Bonds [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 63,000 43,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,000 2,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 64,000 44,000  
Collateralized Mortgage Backed Securities [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 16,000 15,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 16,000 15,000  
Total Fair Value [Member]      
Financial assets:      
Cash 43,000 44,000  
Reported Value Measurement [Member]      
Financial assets:      
Other investments 69,000 61,000  
Cash 43,000 44,000  
Loans 2,000 10,000  
Total financial assets 6,899,000 6,726,000  
Financial liabilities:      
Liabilities for net financial guarantees written 311,000 159,000  
Long-term debt 951,000 1,065,000  
Total financial liabilities 5,361,000 5,418,000  
Reported Value Measurement [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 365,000 507,000  
Reported Value Measurement [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 530,000 568,000  
Reported Value Measurement [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 37,000 38,000  
Reported Value Measurement [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 25,000 27,000  
Reported Value Measurement [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Level 1 [Member]      
Financial assets:      
Cash 43,000 43,000  
Total financial assets 926,000 833,000  
Financial liabilities:      
Liabilities for net financial guarantees written 0 0  
Long-term debt 0 0  
Total financial liabilities 0 0  
Level 1 [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 358,000 506,000  
Level 1 [Member] | Loans Receivable [Member]      
Financial assets:      
Loans 0 0  
Level 1 [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 69,000 61,000  
Level 1 [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 0 0  
Level 1 [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 0 0  
Level 1 [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 0 0  
Level 2 [Member]      
Financial assets:      
Cash 0 1,000  
Total financial assets 1,679,000 1,615,000  
Financial liabilities:      
Liabilities for net financial guarantees written 0 0  
Long-term debt 757,000 864,000  
Total financial liabilities 4,732,000 4,942,000  
Level 2 [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 7,000 1,000  
Level 2 [Member] | Loans Receivable [Member]      
Financial assets:      
Loans 0 0  
Level 2 [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 0 0  
Level 2 [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 37,000 38,000  
Level 2 [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 0 1,000  
Level 2 [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 0 0  
Level 3 [Member]      
Financial assets:      
Cash 0 0  
Total financial assets 3,833,000 3,772,000  
Financial liabilities:      
Liabilities for net financial guarantees written 727,000 476,000  
Long-term debt 16,000 14,000  
Total financial liabilities 868,000 644,000  
Level 3 [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 0 0  
Level 3 [Member] | Loans Receivable [Member]      
Financial assets:      
Loans 2,000 10,000  
Level 3 [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 0 0  
Level 3 [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 0 0  
Level 3 [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 25,000 26,000  
Level 3 [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Commercial Mortgage Backed Securities [Member] | Reported Value Measurement [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 16,000 15,000  
Municipal Bonds [Member] | Reported Value Measurement [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 90,000 102,000  
Corporate Debt Securities [Member] | Reported Value Measurement [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 674,000 598,000  
Debt Security, Government, Non-US [Member] | Reported Value Measurement [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 83,000 76,000  
US Government Debt Securities [Member] | Reported Value Measurement [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 71,000 65,000  
Residential Mortgage-Backed Securities [Member] | Reported Value Measurement [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 238,000 238,000  
Collateralized Debt Obligations [Member] | Reported Value Measurement [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 138,000 137,000  
Asset-backed Securities [Member] | Reported Value Measurement [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 268,000 224,000  
Fair Value, Recurring [Member]      
Financial assets:      
Total financial assets 6,887,000 6,715,000  
Financial liabilities:      
Liabilities for net financial guarantees written 727,000 476,000  
Long-term debt 773,000 878,000  
Total financial liabilities 5,600,000 5,586,000  
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 16,000 15,000  
Fair Value, Recurring [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 365,000 507,000  
Fair Value, Recurring [Member] | Loans Receivable [Member]      
Financial assets:      
Loans 2,000 10,000  
Fair Value, Recurring [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 518,000 556,000  
Fair Value, Recurring [Member] | Asset-backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 268,000 224,000  
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 138,000 137,000  
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 238,000 238,000  
Fair Value, Recurring [Member] | US Government Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 71,000 65,000  
Fair Value, Recurring [Member] | Debt Security, Government, Non-US [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 83,000 76,000  
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 674,000 598,000  
Fair Value, Recurring [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 90,000 102,000  
Fair Value, Recurring [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 37,000 38,000  
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 25,000 27,000  
Fair Value, Recurring [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Fair Value, Recurring [Member] | Level 1 [Member] | Commercial Mortgage Backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 1 [Member] | Collateralized Debt Obligations [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 1 [Member] | US Government Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 71,000 65,000  
Fair Value, Recurring [Member] | Level 1 [Member] | Debt Security, Government, Non-US [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 83,000 76,000  
Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 16,000 15,000  
Fair Value, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 200,000 157,000  
Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 138,000 137,000  
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 238,000 238,000  
Fair Value, Recurring [Member] | Level 2 [Member] | US Government Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 662,000 585,000  
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 90,000 102,000  
Fair Value, Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 69,000 67,000  
Fair Value, Recurring [Member] | Level 3 [Member] | Collateralized Debt Obligations [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 3 [Member] | US Government Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 3 [Member] | Debt Security, Government, Non-US [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Fair Value, Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 13,000 12,000  
Fair Value, Recurring [Member] | Level 3 [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Collateral Pledged [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 36,000 64,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Collateral Pledged [Member] | Short-term Investments [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 36,000 64,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 36,000 64,000  
Collateral Pledged [Member] | Short-term Investments [Member] | Reported Value Measurement [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 36,000 64,000  
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 36,000 64,000  
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Short-term Investments [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 36,000 64,000  
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Short-term Investments [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Level 3 [Member] | Short-term Investments [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Asset Pledged as Collateral [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 36,000 64,000  
Variable Interest Entity, Primary Beneficiary [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 2,056,000 1,967,000  
Financial assets:      
Loans 1,772,000 1,829,000  
Derivative assets 224,000 239,000  
Long-term Debt 2,956,000 3,107,000  
Financial liabilities:      
Derivative liabilities 1,106,000 1,048,000  
Long-term debt 2,785,000 2,788,000  
Variable Interest Entity, Primary Beneficiary [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 1,952,000 1,828,000  
Variable Interest Entity, Primary Beneficiary [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 104,000 96,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 99,000 99,000  
Variable Interest Entity, Primary Beneficiary [Member] | US States and Political Subdivisions Debt Securities      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 43,000  
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 266,000 17,000  
Loans 1,772,000 1,829,000  
Financial liabilities:      
Long-term debt 2,956,000 3,107,000  
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 1,952,000 1,828,000  
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 104,000   $ 96,000
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 185,000 190,000  
Financial liabilities:      
Derivative liabilities 1,106,000 1,048,000  
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 39,000 49,000  
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | US States and Political Subdivisions Debt Securities      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Debt Securities, Trading 0 43,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 266,000 17,000  
Loans 0 0  
Financial liabilities:      
Long-term debt 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 0 0  
Financial liabilities:      
Derivative liabilities 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member] | US States and Political Subdivisions Debt Securities      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Debt Securities, Trading 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 0 0  
Loans 0 0  
Financial liabilities:      
Long-term debt 2,832,000 2,992,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 104,000 96,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 185,000 190,000  
Financial liabilities:      
Derivative liabilities 1,106,000 1,048,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 39,000 49,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | US States and Political Subdivisions Debt Securities      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Debt Securities, Trading 0 43,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 0 0  
Loans 1,772,000 1,829,000  
Financial liabilities:      
Long-term debt 125,000 154,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 1,952,000 1,828,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 0 0  
Financial liabilities:      
Derivative liabilities 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | US States and Political Subdivisions Debt Securities      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Debt Securities, Trading 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 266,000 17,000  
Loans 1,772,000 1,829,000  
Financial liabilities:      
Long-term debt 2,957,000 3,145,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 1,952,000 1,828,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Municipal Bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 104,000 96,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 185,000 190,000  
Financial liabilities:      
Derivative liabilities 1,106,000 1,048,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 39,000 49,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Debt Securities, Trading $ 0 $ 43,000