XML 65 R50.htm IDEA: XBRL DOCUMENT v3.23.3
Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value $ 2,004,000    
Debt Securities, Available-for-sale, Allowance for Credit Loss 2,000 $ 0 $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 27,000 31,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 122,000 106,000  
Financial assets:      
Derivative assets 15,000 28,000  
Other assets 0    
Long-term Debt 505,000 639,000  
Financial liabilities:      
Derivative liabilities 22,000 38,000  
Equity Securities Excluded From Fair Value Table 12,000 12,000  
Debt Securities, Available-for-sale, Amortized Cost 2,100,000 2,041,000  
Debt Securities, Available-for-Sale, Current 2,004,000 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 1,556,000 1,395,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 2,000 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 27,000 31,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 122,000 106,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 1,653,000 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 1,977,000 1,902,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 2,000 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 27,000 31,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 122,000 106,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 2,074,000 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 18,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,000 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 18,000    
Short-term Investments [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Fixed maturity securities, at fair value 421,000 507,000  
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 421,000 507,000  
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 265,000 224,000  
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 11,000 5,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 273,000 227,000  
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 142,000 137,000  
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 1,000 4,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 143,000 141,000  
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 227,000 238,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 2,000 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 23,000 28,000  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 28,000 19,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 234,000 230,000  
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 73,000 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 77,000 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 92,000 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 9,000 9,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 101,000 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 671,000 598,000  
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 65,000 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 67,000 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 3,000 2,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 70,000 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 18,000 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 1,000 0  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 18,000 15,000  
Total Fair Value [Member]      
Financial assets:      
Cash 46,000 44,000  
Reported Value Measurement [Member]      
Financial assets:      
Other investments 87,000 61,000  
Cash 46,000 44,000  
Loans 2,000 10,000  
Total financial assets 6,530,000 6,726,000  
Financial liabilities:      
Liabilities for net financial guarantees written 238,000 159,000  
Long-term debt 967,000 1,065,000  
Total financial liabilities 4,964,000 5,418,000  
Reported Value Measurement [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 421,000 507,000  
Reported Value Measurement [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 461,000 568,000  
Reported Value Measurement [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 22,000 38,000  
Reported Value Measurement [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 14,000 27,000  
Reported Value Measurement [Member] | Warrants [Member]      
Financial assets:      
Derivative assets 1,000 1,000  
Level 1 [Member]      
Financial assets:      
Cash 46,000 43,000  
Total financial assets 997,000 833,000  
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 415,000 506,000  
Level 1 [Member] | Loans Receivable [Member]      
Financial assets:      
Loans 0 0  
Level 1 [Member] | Other Debt Obligations [Member]      
Financial assets:      
Other investments 87,000 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 1,647,000 1,615,000  
Financial liabilities:      
Liabilities for net financial guarantees written 0 0  
Long-term debt 754,000 864,000  
Total financial liabilities 4,372,000 4,942,000  
Level 2 [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 5,000 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 22,000 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 3,512,000 3,772,000  
Financial liabilities:      
Liabilities for net financial guarantees written 646,000 476,000  
Long-term debt 15,000 14,000  
Total financial liabilities 765,000 644,000  
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 14,000 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 18,000 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 95,000 102,000  
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 671,000 598,000  
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 92,000 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 73,000 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 227,000 238,000  
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 142,000 137,000  
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 265,000 224,000  
Fair Value, Recurring [Member]      
Financial assets:      
Total financial assets 6,518,000 6,715,000  
Financial liabilities:      
Liabilities for net financial guarantees written 646,000 476,000  
Long-term debt 769,000 878,000  
Total financial liabilities 5,137,000 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 18,000 15,000  
Fair Value, Recurring [Member] | Short-term Investments [Member]      
Financial assets:      
Short term investments 421,000 507,000  
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 449,000 556,000  
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 265,000 224,000  
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 142,000 137,000  
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 227,000 238,000  
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 73,000 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 92,000 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 671,000 598,000  
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 95,000 102,000  
Fair Value, Recurring [Member] | Interest Rate Swap [Member]      
Financial liabilities:      
Derivative liabilities 22,000 38,000  
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Other Assets [Member]      
Financial assets:      
Derivative assets 14,000 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 73,000 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 92,000 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 18,000 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 197,000 157,000  
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 142,000 137,000  
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 227,000 238,000  
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 652,000 585,000  
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 95,000 102,000  
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 68,000 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 19,000 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 27,000 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 27,000 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 27,000 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 27,000 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 27,000 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 27,000 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 27,000 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 1,948,000 1,967,000  
Financial assets:      
Loans 1,551,000 1,829,000  
Derivative assets 219,000 239,000  
Long-term Debt 2,699,000 3,107,000  
Financial liabilities:      
Derivative liabilities 1,038,000 1,048,000  
Long-term debt 2,535,000 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 1,857,000 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 91,000 96,000  
Financial liabilities:      
Debt Securities, Available-for-sale, Amortized Cost 94,000 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 256,000 17,000  
Loans 1,551,000 1,829,000  
Financial liabilities:      
Long-term debt 2,699,000 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 1,857,000 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 91,000   $ 96,000
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 177,000 190,000  
Financial liabilities:      
Derivative liabilities 1,038,000 1,048,000  
Variable Interest Entity, Primary Beneficiary [Member] | Reported Value Measurement [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 42,000 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 256,000 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  
Loans 0 0  
Financial liabilities:      
Long-term debt 2,558,000 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 91,000 96,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 177,000 190,000  
Financial liabilities:      
Derivative liabilities 1,038,000 1,048,000  
Variable Interest Entity, Primary Beneficiary [Member] | Level 2 [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 42,000 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 1,551,000 1,829,000  
Financial liabilities:      
Long-term debt 104,000 154,000  
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 1,857,000 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 256,000 17,000  
Loans 1,551,000 1,829,000  
Financial liabilities:      
Long-term debt 2,662,000 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 1,857,000 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 91,000 96,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]      
Financial assets:      
Derivative assets 177,000 190,000  
Financial liabilities:      
Derivative liabilities 1,038,000 1,048,000  
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Recurring [Member] | Currency Swaps [Member]      
Financial assets:      
Derivative assets 42,000 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