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Note 5 - Investments Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-for-sale Securities, Amortized Cost    
Loaned securities $ 65,444 $ 27,860
Fixed-maturities available for sale—at amortized cost 4,369,273 4,098,962
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Total, Fair Value 4,527,223 4,021,575
Non Asset Backed Security Investments, Contractual Maturities [Member]    
Available-for-sale Securities, Amortized Cost    
Due in one year or less [1] 132,819  
Due after one year through five years [1] 885,660  
Due after five years through ten years [1] 1,108,946  
Due after ten years [1] 409,043  
Available-for-sale Securities, Fair Value    
Due in one year or less [1] 132,897  
Due after one year through five years [1] 903,546  
Due after five years through ten years [1] 1,168,298  
Due after ten years [1] 455,841  
RMBS    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost [2] 605,687  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value [2] 619,935  
CMBS    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost [2] 542,284  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value [2] 563,338  
Other ABS    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost [2] 718,854  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value [2] 717,986  
Total fixed-maturities available for sale    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 4,403,293  
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 4,561,841  
Fixed maturities | RMBS    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 605,687 334,843
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 619,935 332,142
Fixed maturities | CMBS    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 542,284 546,729
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 563,338 539,915
Fixed maturities | Other ABS    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 718,854 712,748
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 717,986 704,662
Fixed maturities | Total fixed-maturities available for sale    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 4,403,293 4,106,594
Fixed-maturities available for sale—at amortized cost 4,369,273 4,098,962
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 4,561,841 4,028,987
Fixed-maturity investments available for sale, Total, Fair Value 4,527,223 4,021,575
Fixed maturities | Securities Financing Transaction, Cost | Total fixed-maturities available for sale    
Available-for-sale Securities, Amortized Cost    
Loaned securities 34,020 7,632
Fixed maturities | Securities Financing Transaction, Fair Value | Total fixed-maturities available for sale    
Available-for-sale Securities, Amortized Cost    
Loaned securities $ 34,618 $ 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.