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Note 6 - Investments Total Debt and Equity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fixed maturities available for sale securities    
Amortized cost $ 1,893,356 $ 528,660
Fair value 1,940,891 680,258
Gross unrealized gains 6,297 77,231
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 34,300 2,533
Equity securities available for sale    
Available-for-sale Equity Securities, Amortized Cost Basis 75,538 76,900
Equity securities available for sale—at fair value 75,430 143,368
Amortized Cost 1,968,894 605,560
Equity securities    
Fixed maturities available for sale securities    
Gross unrealized gains [1] 0  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax [1] 108  
Equity securities available for sale    
Available-for-sale Equity Securities, Amortized Cost Basis 75,538 [1] 76,900 [2]
Equity securities available for sale—at fair value 75,430 [1] 143,368 [2]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax [2]   66,468
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax [2]   0
Debt Securities    
Fixed maturities available for sale securities    
Amortized cost 1,893,356 528,660
Fair value 1,865,461 536,890
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   10,763
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   2,533
Gross unrealized gains 6,297  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 34,192  
Foreign government securities    
Fixed maturities available for sale securities    
Amortized cost 25,663 19,301
Fair value 24,307 19,366
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   307
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   242
Gross unrealized gains 27  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 1,383  
Asset-backed Securities [Member]    
Fixed maturities available for sale securities    
Amortized cost 359,452 109,420
Fair value 355,494 107,701
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   1,727
Gross unrealized gains 16  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 3,974  
CMBS    
Fixed maturities available for sale securities    
Amortized cost 415,780 57,358
Fair value 406,910 58,234
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   876
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   0
Gross unrealized gains 69  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 8,939  
RMBS    
Fixed maturities available for sale securities    
Amortized cost 226,744 41,467
Fair value 224,905 42,520
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   1,053
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   0
Gross unrealized gains 625  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 2,464  
Corporate bonds and notes    
Fixed maturities available for sale securities    
Amortized cost 815,024 277,678
Fair value 802,193 284,408
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   7,288
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   558
Gross unrealized gains 4,460  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 17,291  
US States and Political Subdivisions Debt Securities [Member]    
Fixed maturities available for sale securities    
Amortized cost 36,920 17,727
Fair value 37,900 18,910
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   1,183
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   0
Gross unrealized gains 1,100  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 120  
US government and agency securities    
Fixed maturities available for sale securities    
Amortized cost 13,773 5,709
Fair value 13,752 5,751
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   48
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   $ 6
Gross unrealized gains 0  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 21  
[1] Comprising primarily a multi-sector exchange-traded fund.
[2] Comprising primarily broadly diversified domestic equity mutual funds.