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Note 5 - Investments Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) security | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) security
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 395 |  | 154
Fair Value, Less Than 12 Months | $ 1,492,967 |  | $ 660,883
Unrealized Losses, Less Than 12 Months | $ 90,490 |  | $ 4,183
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 38 |  | 70
Fair Value, 12 Months or Greater | $ 151,561 |  | $ 254,728
Unrealized Losses, 12 Months or Greater | $ 14,041 |  | $ 4,145
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 433 |  | 224
Fair Value, Total | $ 1,644,528 |  | $ 915,611
Unrealized Losses, Total | $ 104,531 |  | $ 8,328
US government and agency securities |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security |  |  | 2
Fair Value, Less Than 12 Months |  |  | $ 26,142
Unrealized Losses, Less Than 12 Months |  |  | $ 731
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security |  |  | 2
Fair Value, 12 Months or Greater |  |  | $ 2,529
Unrealized Losses, 12 Months or Greater |  |  | $ 2
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security |  |  | 4
Fair Value, Total |  |  | $ 28,671
Unrealized Losses, Total |  |  | $ 733
State and municipal obligations |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 6 |  | 1
Fair Value, Less Than 12 Months | $ 19,560 |  | $ 3,959
Unrealized Losses, Less Than 12 Months | $ 318 |  | $ 41
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 0 |  | 0
Fair Value, 12 Months or Greater | $ 0 |  | $ 0
Unrealized Losses, 12 Months or Greater | $ 0 |  | $ 0
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 6 |  | 1
Fair Value, Total | $ 19,560 |  | $ 3,959
Unrealized Losses, Total | $ 318 |  | $ 41
Corporate bonds and notes |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 174 |  | 25
Fair Value, Less Than 12 Months | $ 763,279 |  | $ 110,871
Unrealized Losses, Less Than 12 Months | $ 48,577 |  | $ 1,728
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 0 |  | 0
Fair Value, 12 Months or Greater | $ 0 |  | $ 0
Unrealized Losses, 12 Months or Greater | $ 0 |  | $ 0
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 174 |  | 25
Fair Value, Total | $ 763,279 |  | $ 110,871
Unrealized Losses, Total | $ 48,577 |  | $ 1,728
RMBS |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 3 |  | 27
Fair Value, Less Than 12 Months | $ 19,874 |  | $ 184,378
Unrealized Losses, Less Than 12 Months | $ 656 |  | $ 535
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 4 |  | 16
Fair Value, 12 Months or Greater | $ 22,323 |  | $ 36,192
Unrealized Losses, 12 Months or Greater | $ 147 |  | $ 992
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 7 |  | 43
Fair Value, Total | $ 42,197 |  | $ 220,570
Unrealized Losses, Total | $ 803 |  | $ 1,527
CMBS |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 60 |  | 36
Fair Value, Less Than 12 Months | $ 201,504 |  | $ 109,589
Unrealized Losses, Less Than 12 Months | $ 11,534 |  | $ 478
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 8 |  | 8
Fair Value, 12 Months or Greater | $ 7,052 |  | $ 6,346
Unrealized Losses, 12 Months or Greater | $ 463 |  | $ 147
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 68 |  | 44
Fair Value, Total | $ 208,556 |  | $ 115,935
Unrealized Losses, Total | $ 11,997 |  | $ 625
Other ABS |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 151 |  | 63
Fair Value, Less Than 12 Months | $ 483,803 |  | $ 225,944
Unrealized Losses, Less Than 12 Months | $ 29,259 |  | $ 670
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 26 |  | 44
Fair Value, 12 Months or Greater | $ 122,186 |  | $ 209,661
Unrealized Losses, 12 Months or Greater | $ 13,431 |  | $ 3,004
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 177 |  | 107
Fair Value, Total | $ 605,989 |  | $ 435,605
Unrealized Losses, Total | $ 42,690 |  | $ 3,674
Foreign government and agency securities |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 1 |  |
Fair Value, Less Than 12 Months | $ 4,947 |  |
Unrealized Losses, Less Than 12 Months | $ 146 |  |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 0 |  |
Fair Value, 12 Months or Greater | $ 0 |  |
Unrealized Losses, 12 Months or Greater | $ 0 |  |
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 1 |  |
Fair Value, Total | $ 4,947 |  |
Unrealized Losses, Total | 146 |  |
OTTI Recognized in Earnings Due to Intent to Sell |  |  |
Continuous Loss Position, Total |  |  |
Other-than-temporary impairment losses | $ 622 |  |
OTTI Recognized in Earnings |  |  |
Continuous Loss Position, Total |  |  |
Other-than-temporary impairment losses |  | $ 0 |

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