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Note 6 - Investments Schedule of Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Amortized Cost    
Amortized cost - Debt Securities $ 3,426,217 $ 2,856,468
Available-for-sale Securities, Fair Value    
Fixed-maturities available for sale—at fair value 3,458,719 $ 2,838,512
Debt Securities [Member]    
Available-for-sale Securities, Amortized Cost    
Amortized cost - Debt Securities [1] 3,440,754  
Available-for-sale Securities, Fair Value    
Fixed-maturities available for sale—at fair value [1] 3,473,382  
Non Asset Backed Security Investments, Contractual Maturities    
Available-for-sale Securities, Amortized Cost    
Due in one year or less 36,688  
Due after one year through five years [2] 705,484  
Due after five years through ten years [2] 1,023,844  
Due after ten years [2] 360,973  
Available-for-sale Securities, Fair Value    
Due in one year or less 36,645  
Due after one year through five years [2] 705,958  
Due after five years through ten years [2] 1,029,896  
Due after ten years [2] 385,712  
RMBS    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis [3] 189,455  
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value [3] 187,229  
CMBS    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis [3] 451,595  
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value [3] 453,394  
Other ABS    
Available-for-sale Securities, Amortized Cost    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis [3] 672,715  
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value [3] $ 674,548  
Minimum [Member]    
Total Debt Securities [Line Items]    
Investment as a Percentage of Total Stockholder's Equity 10.00%  
[1] Includes securities loaned under securities lending agreements.
[2] Actual maturities may differ as a result of calls before scheduled maturity.
[3] RMBS, CMBS, and Other ABS are shown separately, as they are not due at a single maturity date.