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Note 5 - Investments Contractual Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Available-for-sale Securities, Amortized Cost    
Fixed-maturities available for sale—at amortized cost $ 4,564,616 $ 4,549,534
Available-for-sale Securities, Fair Value    
Loaned securities 47,520 66,442
Fixed-maturity investments available for sale, Total, Fair Value 4,603,613 4,688,911
Non asset-backed securities    
Available-for-sale Securities, Amortized Cost    
Due in one year or less [1] 105,520  
Due after one year through five years [1] 823,582  
Due after five years through ten years [1] 1,082,394  
Due after ten years [1] 493,353  
Available-for-sale Securities, Fair Value    
Due in one year or less [1] 104,855  
Due after one year through five years [1] 829,134  
Due after five years through ten years [1] 1,089,685  
Due after ten years [1] 526,338  
RMBS    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost [2] 747,271  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value [2] 779,590  
CMBS    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost [2] 609,518  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value [2] 610,877  
Other ABS    
Available-for-sale Securities, Amortized Cost    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost [2] 708,357  
Available-for-sale Securities, Fair Value    
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value [2] 666,918  
Total fixed-maturities available for sale    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 4,569,995  
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 4,607,397  
Fixed-maturities available for sale | RMBS    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 747,271 766,429
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 779,590 779,354
Fixed-maturities available for sale | CMBS    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 609,518 593,647
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 610,877 608,015
Fixed-maturities available for sale | Other ABS    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 708,357 760,785
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 666,918 759,129
Fixed-maturities available for sale | Total fixed-maturities available for sale    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities 4,569,995 4,573,387
Fixed-maturities available for sale—at amortized cost 4,564,616 4,549,534
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Securities, Including Loaned Securities 4,607,397 4,712,924
Fixed-maturity investments available for sale, Total, Fair Value 4,603,613 4,688,911
Fixed-maturities available for sale | Securities Financing Transaction, Cost | Total fixed-maturities available for sale    
Available-for-sale Securities, Amortized Cost    
Securities Loaned, Asset, Amortized Cost Basis 5,379 23,853
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Total fixed-maturities available for sale    
Available-for-sale Securities, Fair Value    
Loaned securities $ 3,784 $ 24,013
[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.