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Note 5 - Investments Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Total, Amortized Cost $ 3,838,823 $ 3,426,217
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Total, Fair Value 3,763,710 $ 3,458,719
Non Asset Backed Security Investments, Contractual Maturities [Member]    
Available-for-sale Securities, Amortized Cost    
Due in one year or less [1] 51,228  
Due after one year through five years [1] 823,314  
Due after five years through ten years [1] 1,099,144  
Due after ten years [1] 401,551  
Available-for-sale Securities, Fair Value    
Due in one year or less [1] 51,101  
Due after one year through five years [1] 809,555  
Due after five years through ten years [1] 1,065,556  
Due after ten years [1] 395,198  
RMBS    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost [2] 258,152  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value [2] 250,056  
CMBS    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost [2] 536,982  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value [2] 525,858  
Other ABS    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost [2] 675,686  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value [2] 673,418  
Total fixed-maturities available for sale    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Total, Amortized Cost [3] 3,846,057  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Total, Fair Value [3] $ 3,770,742  
[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.
[3] Includes securities loaned under securities lending agreements.