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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
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value $ 2,073,000    
Debt Securities, Available-for-sale, Allowance for Credit Loss 1,000 $ 3,000 $ 2,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 54,000 40,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 49,000 71,000  
Financial assets:      
Derivative assets 33,000 26,000  
Other assets 0    
Short-Term Debt 148,000    
Long-term Debt 518,000 508,000  
Financial liabilities:      
Derivative liabilities 35,000 35,000  
Equity Securities Excluded From Fair Value Table 26,000 13,000  
Debt Securities, Available-for-sale, Amortized Cost 2,069,000 2,197,000  
Debt Securities, Available-for-Sale, Current 2,073,000 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 1,740,000 1,710,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 1,000 3,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 54,000 40,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 49,000 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 2,046,000 2,135,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 1,000 3,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 54,000 40,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 49,000 71,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 2,042,000 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 24,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 24,000    
Short-term Investments [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 305,000 426,000  
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 305,000 426,000  
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 252,000 303,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 13,000 3,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,000 1,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 242,000 301,000  
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 113,000 139,000  
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 113,000 139,000  
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 281,000 250,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 1,000 3,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 32,000 28,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 5,000 14,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 255,000 239,000  
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 91,000 82,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,000 1,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,000 4,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 92,000 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 115,000 100,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,000 1,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 6,000 6,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 120,000 105,000  
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 779,000 745,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,000 4,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 34,000 44,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 808,000 785,000  
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 84,000 72,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,000 1,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,000 1,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 83,000 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 24,000 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 24,000 19,000  
Total Fair Value [Member]      
Financial assets:      
Cash 70,000 28,000  
Reported Value Measurement [Member]      
Financial assets:      
Other investments 174,000 77,000  
Cash 70,000 28,000  
Loans 1,000 2,000  
Total financial assets 6,890,000 7,022,000  
Short-Term Debt 151,000 0  
Financial liabilities:      
Liabilities for net financial guarantees written 247,000 292,000  
Long-term debt 1,031,000 983,000  
Total financial liabilities 5,683,000 5,474,000  
Reported Value Measurement [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 305,000 426,000  
Reported Value Measurement [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 561,000 475,000  
Reported Value Measurement [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 35,000 35,000  
Reported Value Measurement [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 26,000 25,000  
Reported Value Measurement [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Reported Value Measurement [Member] | Foreign Exchange Forward      
Financial assets:      
Derivative assets 6,000 0  
Level 1 [Member]      
Financial assets:      
Cash 70,000 27,000  
Total financial assets 822,000 979,000  
Short-Term Debt 0 0  
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 304,000 421,000  
Level 1 [Member] | Loans Receivable [Member]      
Financial assets:      
Loans 0 0  
Level 1 [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 174,000 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 Forward      
Financial assets:      
Derivative assets 0 0  
Level 2 [Member]      
Financial assets:      
Cash 0 2,000  
Total financial assets 1,776,000 1,795,000  
Short-Term Debt 0 0  
Financial liabilities:      
Liabilities for net financial guarantees written 0 0  
Long-term debt 724,000 679,000  
Total financial liabilities 4,768,000 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 35,000 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 Forward      
Financial assets:      
Derivative assets 6,000 0  
Level 3 [Member]      
Financial assets:      
Cash 0 0  
Total financial assets 3,904,000 3,850,000  
Short-Term Debt 153,000 0  
Financial liabilities:      
Liabilities for net financial guarantees written 523,000 788,000  
Long-term debt 20,000 18,000  
Total financial liabilities 911,000 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 26,000 25,000  
Level 3 [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Level 3 [Member] | Foreign Exchange Forward      
Financial assets:      
Derivative assets 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 24,000 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 84,000 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 779,000 745,000  
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 115,000 100,000  
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 91,000 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 281,000 250,000  
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 113,000 139,000  
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 252,000 303,000  
Fair Value, Recurring [Member]      
Financial assets:      
Total financial assets 6,864,000 7,010,000  
Short-Term Debt 153,000 0  
Financial liabilities:      
Liabilities for net financial guarantees written 523,000 788,000  
Long-term debt 743,000 697,000  
Total financial liabilities 5,678,000 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 24,000 19,000  
Fair Value, Recurring [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 305,000 426,000  
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 535,000 463,000  
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 252,000 303,000  
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 113,000 139,000  
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 281,000 250,000  
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 91,000 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 115,000 100,000  
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 779,000 745,000  
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 84,000 99,000  
Fair Value, Recurring [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 35,000 35,000  
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 26,000 25,000  
Fair Value, Recurring [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Fair Value, Recurring [Member] | Foreign Exchange Forward      
Financial assets:      
Derivative assets 6,000 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 91,000 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 109,000 100,000  
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 24,000 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 173,000 235,000  
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 113,000 139,000  
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 281,000 250,000  
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 6,000 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 779,000 726,000  
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 84,000 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 79,000 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 27,000 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 0 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 27,000 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 27,000 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 27,000 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 2,238,000 2,167,000  
Financial assets:      
Loans 1,651,000 1,663,000  
Derivative assets 216,000 226,000  
Long-term Debt 2,996,000 2,967,000  
Financial liabilities:      
Derivative liabilities 1,223,000 1,197,000  
Long-term debt 2,738,000 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 2,146,000 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 92,000 95,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8,000 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 47,000 246,000  
Loans 1,651,000 1,663,000  
Financial liabilities:      
Long-term debt 2,996,000 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 2,146,000 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 92,000   $ 95,000
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 189,000 190,000  
Financial liabilities:      
Derivative liabilities 1,223,000 1,197,000  
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 26,000 36,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 1 [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 47,000 246,000  
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 2,786,000 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 92,000 95,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 189,000 190,000  
Financial liabilities:      
Derivative liabilities 1,223,000 1,197,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 26,000 36,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member]      
Financial assets:      
Restricted Cash and Cash Equivalents, Current 0 0  
Loans 1,651,000 1,663,000  
Financial liabilities:      
Long-term debt 216,000 220,000  
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 2,146,000 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 47,000 246,000  
Loans 1,651,000 1,663,000  
Financial liabilities:      
Long-term debt 3,002,000 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 2,146,000 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 92,000 95,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 189,000 190,000  
Financial liabilities:      
Derivative liabilities 1,223,000 1,197,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets $ 26,000 $ 36,000