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Note 5 - Investments Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 2,614,680 $ 1,893,356
Available-for-sale Securities 2,711,895 1,940,891
Available-for-sale Equity Securities, Amortized Cost Basis 500 75,538
Available-for-sale Securities, Equity Securities 500 75,430
Amortized Cost Debt and Equity Securities 2,615,180 1,968,894
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 102,324 6,297
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 5,609 34,300
US government and agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 110,167 13,773
Available-for-sale Securities 114,482 13,752
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4,315 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0 21
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 72,134 36,920
Available-for-sale Securities 79,052 37,900
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 6,918 1,100
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0 120
Corporate bonds and notes    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 1,163,406 815,024
Available-for-sale Securities 1,225,809 802,193
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 63,955 4,460
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 1,552 17,291
RMBS    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 316,533 226,744
Available-for-sale Securities 323,980 224,905
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7,641 625
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 194 2,464
CMBS    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 485,693 415,780
Available-for-sale Securities 501,811 406,910
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 17,061 69
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 943 8,939
Other ABS    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 436,535 359,452
Available-for-sale Securities 435,693 355,494
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,754 16
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 2,596 3,974
Foreign government securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 29,712 25,663
Available-for-sale Securities 30,068 24,307
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 680 27
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 324 1,383
Other than Securities Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 500  
Available-for-sale Securities 500  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0  
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 2,614,680 1,893,356
Available-for-sale Securities 2,711,395 1,865,461
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 102,324 6,297
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 5,609 34,192
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 500 75,538 [1]
Available-for-sale Securities, Equity Securities 500 75,430 [1]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0 0 [1]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax $ 0 $ 108 [1]
[1] Comprising primarily a multi-sector exchange-traded fund.