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Note 6 - Investments Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Available-for-sale Securities, Amortized Cost    
Fixed-maturities, Available-for-sale, Amortized Cost $ 4,549,534 $ 4,098,962
Available-for-sale Securities, Fair Value    
Fixed-maturities available for sale—at fair value 4,688,911 4,021,575
Securities Loaned, Asset 66,442 27,860
Fixed-maturities available for sale | Non Asset Backed Security Investments, Contractual Maturities    
Available-for-sale Securities, Amortized Cost    
Due in one year or less 146,985  
Due after one year through five years [1] 834,096  
Due after five years through ten years [1] 1,062,725  
Due after ten years [1] 408,720  
Available-for-sale Securities, Fair Value    
Due in one year or less 147,541  
Due after one year through five years [1] 852,660  
Due after five years through ten years [1] 1,121,536  
Due after ten years [1] 444,689  
Fixed-maturities available for sale | RMBS    
Available-for-sale Securities, Amortized Cost    
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [2] 766,429  
Available-for-sale Securities, Fair Value    
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [2] 779,354  
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 766,429 334,843
Available-for-sale Securities, Debt Securities, Including Loaned Securities 779,354 332,142
Fixed-maturities available for sale | CMBS    
Available-for-sale Securities, Amortized Cost    
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [2] 593,647  
Available-for-sale Securities, Fair Value    
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [2] 608,015  
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 593,647 546,729
Available-for-sale Securities, Debt Securities, Including Loaned Securities 608,015 539,915
Fixed-maturities available for sale | Other ABS    
Available-for-sale Securities, Amortized Cost    
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost [2] 760,785  
Available-for-sale Securities, Fair Value    
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [2] 759,129  
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 760,785 712,748
Available-for-sale Securities, Debt Securities, Including Loaned Securities 759,129 704,662
Fixed-maturities available for sale | Total fixed-maturities available for sale    
Available-for-sale Securities, Amortized Cost    
Fixed-maturities, Available-for-sale, Amortized Cost 4,549,534 4,098,962
Available-for-sale Securities, Fair Value    
Fixed-maturities available for sale—at fair value 4,688,911 4,021,575
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 4,573,387 4,106,594
Available-for-sale Securities, Debt Securities, Including Loaned Securities 4,712,924 4,028,987
Securities Financing Transaction, Amortized Cost | Fixed-maturities available for sale | Total fixed-maturities available for sale    
Available-for-sale Securities, Fair Value    
Securities Loaned, Asset 23,853 7,632
Securities Financing Transaction, Fair Value | Fixed-maturities available for sale    
Available-for-sale Securities, Fair Value    
Securities Loaned, Asset 24,000  
Securities Financing Transaction, Fair Value | Fixed-maturities available for sale | Total fixed-maturities available for sale    
Available-for-sale Securities, Fair Value    
Securities Loaned, Asset $ 24,013 $ 7,412
[1]
Actual maturities may differ as a result of calls before scheduled maturity.
[2]
RMBS, CMBS, and Other ABS are shown separately, as they are not due at a single maturity date.