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Note 6 - Investments - Available for Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost $ 5,391,584   $ 5,393,623      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   (948)      
Less: loaned securities 135,058   57,499      
Fixed-maturity investments available for sale, Total, Fair Value 5,580,212   5,723,340      
Fixed-maturities available for sale | U.S. government and agencies securities            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 256,519   176,033      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 523   1,677      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,884)   (3,611)      
Available-for-sale Securities, Debt Securities, Including Loaned Securities 255,158   174,099      
Fixed-maturities available for sale | State and municipal obligations            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 146,234   149,258      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 15,134   16,113      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (357)   (100)      
Available-for-sale Securities, Debt Securities, Including Loaned Securities 161,011   165,271      
Fixed-maturities available for sale | Corporate bonds and notes            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 2,892,347   2,832,350      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 $ 0 (948) $ (2,290) $ (2,476) $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 155,631   250,771      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (24,981)   (3,758)      
Available-for-sale Securities, Debt Securities, Including Loaned Securities 3,022,997   3,078,415      
Fixed-maturities available for sale | RMBS            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 695,481   799,814      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 20,925   34,439      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (3,300)   (314)      
Available-for-sale Securities, Debt Securities, Including Loaned Securities 713,106   833,939      
Fixed-maturities available for sale | CMBS            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 680,503   645,071      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 28,619   39,495      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (2,481)   (3,301)      
Available-for-sale Securities, Debt Securities, Including Loaned Securities 706,641   681,265      
Fixed-maturities available for sale | CLO            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 558,523   569,173      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,340   2,026      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (543)   (2,641)      
Available-for-sale Securities, Debt Securities, Including Loaned Securities 559,320   568,558      
Fixed-maturities available for sale | Other ABS            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 193,727   249,988      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,768   2,901      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (476)   (432)      
Available-for-sale Securities, Debt Securities, Including Loaned Securities 195,019   252,457      
Fixed-maturities available for sale | Foreign government and agency securities            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 5,107   5,100      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 237   338      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0   0      
Available-for-sale Securities, Debt Securities, Including Loaned Securities 5,344   5,438      
Fixed-maturities available for sale | Mortgage insurance-linked notes            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 45,384          
Debt Securities, Available-for-sale, Allowance for Credit Loss 0          
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,307          
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0          
Available-for-sale Securities, Debt Securities, Including Loaned Securities 47,691          
Fixed-maturities available for sale | Total fixed-maturities available for sale            
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 5,473,825   5,426,787      
Debt Securities, Available-for-sale, Amortized Cost 5,391,584   5,393,623      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   (948)      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 226,484   347,760      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (34,022)   (14,157)      
Available-for-sale Securities, Debt Securities, Including Loaned Securities 5,666,287   5,759,442      
Fixed-maturity investments available for sale, Total, Fair Value 5,580,212   5,723,340      
Fixed-maturities available for sale | Securities Financing Transaction, Cost | Total fixed-maturities available for sale            
Debt Securities, Available-for-sale [Line Items]            
Less: loaned securities 82,241   33,164      
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Total fixed-maturities available for sale            
Debt Securities, Available-for-sale [Line Items]            
Less: loaned securities $ 86,075   $ 36,102