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Note 5 - Investments Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) security | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) security | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) security
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 115 |  | 115 |  | 550
Fair Value, Less Than 12 Months | $ 516,478 |  | $ 516,478 |  | $ 2,201,228
Unrealized Losses, Less Than 12 Months | $ 3,013 |  | $ 3,013 |  | $ 50,707
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 80 |  | 80 |  | 237
Fair Value, 12 Months or Greater | $ 227,267 |  | $ 227,267 |  | $ 957,742
Unrealized Losses, 12 Months or Greater | $ 3,469 |  | $ 3,469 |  | $ 37,333
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 195 |  | 195 |  | 787
Fair Value, Total | $ 743,745 |  | $ 743,745 |  | $ 3,158,970
Unrealized Losses, Total | $ 6,482 |  | $ 6,482 |  | $ 88,040
US government and agency securities |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 4 |  | 4 |  | 2
Fair Value, Less Than 12 Months | $ 68,719 |  | $ 68,719 |  | $ 27,415
Unrealized Losses, Less Than 12 Months | $ 89 |  | $ 89 |  | $ 796
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 3 |  | 3 |  | 8
Fair Value, 12 Months or Greater | $ 9,051 |  | $ 9,051 |  | $ 23,476
Unrealized Losses, 12 Months or Greater | $ 17 |  | $ 17 |  | $ 712
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 7 |  | 7 |  | 10
Fair Value, Total | $ 77,770 |  | $ 77,770 |  | $ 50,891
Unrealized Losses, Total | $ 106 |  | $ 106 |  | $ 1,508
State and municipal obligations |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security |  |  |  |  | 12
Fair Value, Less Than 12 Months |  |  |  |  | $ 41,263
Unrealized Losses, Less Than 12 Months |  |  |  |  | $ 955
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security |  |  |  |  | 16
Fair Value, 12 Months or Greater |  |  |  |  | $ 39,982
Unrealized Losses, 12 Months or Greater |  |  |  |  | $ 945
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security |  |  |  |  | 28
Fair Value, Total |  |  |  |  | $ 81,245
Unrealized Losses, Total |  |  |  |  | $ 1,900
Corporate bonds and notes |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 28 |  | 28 |  | 330
Fair Value, Less Than 12 Months | $ 126,732 |  | $ 126,732 |  | $ 1,208,430
Unrealized Losses, Less Than 12 Months | $ 1,145 |  | $ 1,145 |  | $ 36,284
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 4 |  | 4 |  | 126
Fair Value, 12 Months or Greater | $ 8,543 |  | $ 8,543 |  | $ 601,533
Unrealized Losses, 12 Months or Greater | $ 19 |  | $ 19 |  | $ 27,604
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 32 |  | 32 |  | 456
Fair Value, Total | $ 135,275 |  | $ 135,275 |  | $ 1,809,963
Unrealized Losses, Total | $ 1,164 |  | $ 1,164 |  | $ 63,888
RMBS |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 5 |  | 5 |  | 15
Fair Value, Less Than 12 Months | $ 30,478 |  | $ 30,478 |  | $ 92,315
Unrealized Losses, Less Than 12 Months | $ 52 |  | $ 52 |  | $ 782
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 23 |  | 23 |  | 28
Fair Value, 12 Months or Greater | $ 44,649 |  | $ 44,649 |  | $ 77,395
Unrealized Losses, 12 Months or Greater | $ 986 |  | $ 986 |  | $ 3,704
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 28 |  | 28 |  | 43
Fair Value, Total | $ 75,127 |  | $ 75,127 |  | $ 169,710
Unrealized Losses, Total | $ 1,038 |  | $ 1,038 |  | $ 4,486
CMBS |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 18 |  | 18 |  | 62
Fair Value, Less Than 12 Months | $ 32,861 |  | $ 32,861 |  | $ 328,696
Unrealized Losses, Less Than 12 Months | $ 724 |  | $ 724 |  | $ 3,973
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 10 |  | 10 |  | 33
Fair Value, 12 Months or Greater | $ 9,120 |  | $ 9,120 |  | $ 125,728
Unrealized Losses, 12 Months or Greater | $ 188 |  | $ 188 |  | $ 3,385
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 28 |  | 28 |  | 95
Fair Value, Total | $ 41,981 |  | $ 41,981 |  | $ 454,424
Unrealized Losses, Total | $ 912 |  | $ 912 |  | $ 7,358
Other ABS |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 60 |  | 60 |  | 129
Fair Value, Less Than 12 Months | $ 257,688 |  | $ 257,688 |  | $ 503,109
Unrealized Losses, Less Than 12 Months | $ 1,003 |  | $ 1,003 |  | $ 7,917
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 40 |  | 40 |  | 26
Fair Value, 12 Months or Greater | $ 155,904 |  | $ 155,904 |  | $ 89,628
Unrealized Losses, 12 Months or Greater | $ 2,259 |  | $ 2,259 |  | $ 983
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 100 |  | 100 |  | 155
Fair Value, Total | $ 413,592 |  | $ 413,592 |  | $ 592,737
Unrealized Losses, Total | 3,262 |  | 3,262 |  | $ 8,900
OTTI Recognized in Earnings |  |  |  |  |
Continuous Loss Position, Total |  |  |  |  |
Other-than-temporary impairment losses | $ 0 | $ 900 | 0 | $ 1,744 |
OTTI Recognized in AOCI |  |  |  |  |
Continuous Loss Position, Total |  |  |  |  |
Other-than-temporary impairment losses |  |  | $ 0 | $ 0 |

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