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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, 2024
Dec. 31, 2023
Jun. 30, 2023
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value $ 2,043,000    
Debt Securities, Available-for-sale, Allowance for Credit Loss 3,000 $ 3,000 $ 1,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 45,000 40,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 78,000 71,000  
Financial assets:      
Derivative assets 18,000 26,000  
Other assets 0    
Long-term Debt 515,000 508,000  
Financial liabilities:      
Derivative liabilities 26,000 35,000  
Equity Securities Excluded From Fair Value Table 26,000 13,000  
Debt Securities, Available-for-sale, Amortized Cost 2,078,000 2,197,000  
Debt Securities, Available-for-Sale, Current 2,043,000 2,162,000  
Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 1,703,000 1,710,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 3,000 3,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 45,000 40,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 77,000 71,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 1,737,000 1,744,000  
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 2,017,000 2,135,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 3,000 3,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 45,000 40,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 77,000 71,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 2,051,000 2,170,000  
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 46,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 46,000    
Short-term Investments [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 314,000 426,000  
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 314,000 426,000  
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 241,000 303,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 12,000 3,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 5,000 1,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 234,000 301,000  
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 141,000 139,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,000 1,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 1,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 141,000 139,000  
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 253,000 250,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 3,000 3,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 28,000 28,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 13,000 14,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 240,000 239,000  
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 105,000 82,000  
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 4,000 4,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 108,000 85,000  
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 105,000 100,000  
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 7,000 6,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 111,000 105,000  
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 742,000 745,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,000 4,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 46,000 44,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 786,000 785,000  
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 71,000 72,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,000 1,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,000 1,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 71,000 72,000  
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 46,000 19,000  
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 46,000 19,000  
Total Fair Value [Member]      
Financial assets:      
Cash 35,000 28,000  
Reported Value Measurement [Member]      
Financial assets:      
Other investments 153,000 77,000  
Cash 35,000 28,000  
Loans 2,000 2,000  
Total financial assets 6,626,000 7,022,000  
Financial liabilities:      
Liabilities for net financial guarantees written 229,000 292,000  
Long-term debt 1,015,000 983,000  
Total financial liabilities 5,258,000 5,474,000  
Reported Value Measurement [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 314,000 426,000  
Reported Value Measurement [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 558,000 475,000  
Reported Value Measurement [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 25,000 35,000  
Reported Value Measurement [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 18,000 25,000  
Reported Value Measurement [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Reported Value Measurement [Member] | Foreign Exchange Future      
Financial liabilities:      
Derivative liabilities 0 0  
Level 1 [Member]      
Financial assets:      
Cash 35,000 27,000  
Total financial assets 797,000 979,000  
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 313,000 421,000  
Level 1 [Member] | Loans Receivable [Member]      
Financial assets:      
Loans 0 0  
Level 1 [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 153,000 77,000  
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 1 [Member] | Foreign Exchange Future      
Financial liabilities:      
Derivative liabilities 0 0  
Level 2 [Member]      
Financial assets:      
Cash 0 2,000  
Total financial assets 1,748,000 1,795,000  
Financial liabilities:      
Liabilities for net financial guarantees written 0 0  
Long-term debt 753,000 679,000  
Total financial liabilities 4,561,000 4,671,000  
Level 2 [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 1,000 5,000  
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 25,000 35,000  
Level 2 [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 0 0  
Level 2 [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 0 0  
Level 2 [Member] | Foreign Exchange Future      
Financial liabilities:      
Derivative liabilities 0 0  
Level 3 [Member]      
Financial assets:      
Cash 0 0  
Total financial assets 3,675,000 3,850,000  
Financial liabilities:      
Liabilities for net financial guarantees written 488,000 788,000  
Long-term debt 19,000 18,000  
Total financial liabilities 712,000 1,026,000  
Level 3 [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 0 0  
Level 3 [Member] | Loans Receivable [Member]      
Financial assets:      
Loans 1,000 2,000  
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 18,000 25,000  
Level 3 [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Level 3 [Member] | Foreign Exchange Future      
Financial liabilities:      
Derivative liabilities 0 0  
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 46,000 19,000  
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 101,000 99,000  
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 742,000 745,000  
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 105,000 100,000  
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 105,000 82,000  
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 253,000 250,000  
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 141,000 139,000  
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 241,000 303,000  
Fair Value, Recurring [Member]      
Financial assets:      
Total financial assets 6,600,000 7,010,000  
Financial liabilities:      
Liabilities for net financial guarantees written 488,000 788,000  
Long-term debt 772,000 697,000  
Total financial liabilities 5,273,000 5,697,000  
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 46,000 19,000  
Fair Value, Recurring [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 314,000 426,000  
Fair Value, Recurring [Member] | Loans Receivable [Member]      
Financial assets:      
Loans 1,000 2,000  
Fair Value, Recurring [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 533,000 463,000  
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 241,000 303,000  
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 141,000 139,000  
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 253,000 250,000  
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 105,000 82,000  
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 105,000 100,000  
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 742,000 745,000  
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 101,000 99,000  
Fair Value, Recurring [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 25,000 35,000  
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 18,000 25,000  
Fair Value, Recurring [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Fair Value, Recurring [Member] | Foreign Exchange Future      
Financial liabilities:      
Derivative liabilities 0 0  
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 105,000 82,000  
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 105,000 100,000  
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 46,000 19,000  
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 164,000 235,000  
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 141,000 139,000  
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 253,000 250,000  
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 742,000 726,000  
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 101,000 99,000  
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 77,000 68,000  
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 0 19,000  
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 25,000 27,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,000 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 27,000 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 0 27,000  
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 0 27,000  
Collateral Pledged [Member] | 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 25,000 0  
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 0 27,000  
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 0 27,000  
Collateral Pledged [Member] | 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 25,000 0  
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 0 27,000  
Collateral Pledged [Member] | 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 25,000 0  
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 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  
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  
Collateral Pledged [Member] | 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  
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 27,000 27,000  
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 2,101,000 2,167,000  
Financial assets:      
Loans 1,567,000 1,663,000  
Derivative assets 208,000 226,000  
Long-term Debt 2,853,000 2,967,000  
Financial liabilities:      
Derivative liabilities 1,136,000 1,197,000  
Long-term debt 2,599,000 2,710,000  
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 2,010,000 2,072,000  
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 91,000 95,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,000 7,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 85,000 88,000  
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 62,000 246,000  
Loans 1,567,000 1,663,000  
Financial liabilities:      
Long-term debt 2,853,000 2,967,000  
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 2,010,000 2,072,000  
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 91,000   $ 95,000
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 174,000 190,000  
Financial liabilities:      
Derivative liabilities 1,136,000 1,197,000  
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 34,000 36,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 62,000 246,000  
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 2 [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 0  
Loans 0 0  
Financial liabilities:      
Long-term debt 2,646,000 2,760,000  
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 91,000 95,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 174,000 190,000  
Financial liabilities:      
Derivative liabilities 1,136,000 1,197,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 34,000 36,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 0 0  
Loans 1,567,000 1,663,000  
Financial liabilities:      
Long-term debt 205,000 220,000  
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 2,010,000 2,072,000  
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] | Fair Value, Recurring [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 62,000 246,000  
Loans 1,567,000 1,663,000  
Financial liabilities:      
Long-term debt 2,852,000 2,980,000  
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 2,010,000 2,072,000  
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 91,000 95,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 174,000 190,000  
Financial liabilities:      
Derivative liabilities 1,136,000 1,197,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets $ 34,000 $ 36,000