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Special Purpose Entities, Including Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Entity
Dec. 31, 2018
USD ($)
Entity
Mar. 31, 2018
USD ($)
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) $ 3,611,947    
Restricted Cash 0 $ 19,405  
Derivative assets 76,400 59,468  
Other assets 90,977 137,628  
Total assets 15,022,899 14,588,711  
Interest Payable 391,335 375,808  
Long-term debt 2,929,227 2,928,929  
Derivative Liability 86,534 76,699  
Other Liabilities 71,402 63,792  
Liabilities 13,357,011 12,955,564  
Variable Interest Entity, Primary Beneficiary [Member]      
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) 3,128,995 2,737,286  
Restricted Cash 3,254 999 $ 1,134
Loans Receivable, Net 4,375,761 4,287,664  
Derivative assets 59,228 66,302  
Other assets 4,686 1,058  
Total assets 7,571,924 7,093,309  
Interest Payable 2,785 556  
Long-term debt 5,401,992 5,268,596  
Long-term Debt, at par less amortized discount 335,271 0  
Long-term debt 5,737,263 5,268,596  
Derivative Liability 1,781,903 1,712,062  
Other Liabilities 56 30  
Liabilities 7,522,007 6,981,244  
Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) 2,858,404 2,737,286  
Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) 270,591 0  
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) 2,858,404 2,737,286  
Restricted Cash 1,056 999  
Loans Receivable, Net 4,375,761 4,287,664  
Derivative assets 59,228 66,302  
Other assets 3,320 1,058  
Total assets 7,297,769 7,093,309  
Interest Payable 2,785 556  
Long-term debt 5,401,992 5,268,596  
Long-term Debt, at par less amortized discount 0 0  
Long-term debt 5,401,992 5,268,596  
Derivative Liability 1,781,903 1,712,062  
Other Liabilities 56 30  
Liabilities 7,186,736 6,981,244  
Ambac UK [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) 2,858,404 2,737,286  
Ambac UK [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) 0 0  
Ambac Assurance [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) 270,591 0  
Restricted Cash 2,198 0  
Loans Receivable, Net 0 0  
Derivative assets 0 0  
Other assets 1,366 0  
Total assets 274,155 0  
Interest Payable 0 0  
Long-term debt 0 0  
Long-term Debt, at par less amortized discount 335,271 0  
Long-term debt 335,271 0  
Derivative Liability 0 0  
Other Liabilities 0 0  
Liabilities 335,271 0  
Ambac Assurance [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) 0 0  
Ambac Assurance [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) $ 270,591 $ 0  
Consolidated Entities [Member]      
Number Of Consolidated Variable Interest Entities | Entity 8 7  
Consolidated Entities [Member] | Ambac UK [Member]      
Number Of Consolidated Variable Interest Entities | Entity 7 7  
Consolidated Entities [Member] | Ambac Assurance [Member]      
Number Of Consolidated Variable Interest Entities | Entity 1 0