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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, 2019 USD ($) security | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) security
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 168 |  | 550
Fair Value, Less Than 12 Months | $ 747,531 |  | $ 2,201,228
Unrealized Losses, Less Than 12 Months | $ 6,406 |  | $ 50,707
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 244 |  | 237
Fair Value, 12 Months or Greater | $ 994,813 |  | $ 957,742
Unrealized Losses, 12 Months or Greater | $ 18,135 |  | $ 37,333
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 412 |  | 787
Fair Value, Total | $ 1,742,344 |  | $ 3,158,970
Unrealized Losses, Total | $ 24,541 |  | $ 88,040
US government and agency securities |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 0 |  | 2
Fair Value, Less Than 12 Months | $ 0 |  | $ 27,415
Unrealized Losses, Less Than 12 Months | $ 0 |  | $ 796
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 9 |  | 8
Fair Value, 12 Months or Greater | $ 38,177 |  | $ 23,476
Unrealized Losses, 12 Months or Greater | $ 528 |  | $ 712
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 9 |  | 10
Fair Value, Total | $ 38,177 |  | $ 50,891
Unrealized Losses, Total | $ 528 |  | $ 1,508
State and municipal obligations |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 1 |  | 12
Fair Value, Less Than 12 Months | $ 6,487 |  | $ 41,263
Unrealized Losses, Less Than 12 Months | $ 27 |  | $ 955
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 3 |  | 16
Fair Value, 12 Months or Greater | $ 10,983 |  | $ 39,982
Unrealized Losses, 12 Months or Greater | $ 274 |  | $ 945
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 4 |  | 28
Fair Value, Total | $ 17,470 |  | $ 81,245
Unrealized Losses, Total | $ 301 |  | $ 1,900
Corporate bonds and notes |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 54 |  | 330
Fair Value, Less Than 12 Months | $ 220,831 |  | $ 1,208,430
Unrealized Losses, Less Than 12 Months | $ 2,676 |  | $ 36,284
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 148 |  | 126
Fair Value, 12 Months or Greater | $ 656,876 |  | $ 601,533
Unrealized Losses, 12 Months or Greater | $ 11,839 |  | $ 27,604
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 202 |  | 456
Fair Value, Total | $ 877,707 |  | $ 1,809,963
Unrealized Losses, Total | $ 14,515 |  | $ 63,888
RMBS |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 9 |  | 15
Fair Value, Less Than 12 Months | $ 60,465 |  | $ 92,315
Unrealized Losses, Less Than 12 Months | $ 124 |  | $ 782
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 24 |  | 28
Fair Value, 12 Months or Greater | $ 67,863 |  | $ 77,395
Unrealized Losses, 12 Months or Greater | $ 2,626 |  | $ 3,704
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 33 |  | 43
Fair Value, Total | $ 128,328 |  | $ 169,710
Unrealized Losses, Total | $ 2,750 |  | $ 4,486
CMBS |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 33 |  | 62
Fair Value, Less Than 12 Months | $ 138,708 |  | $ 328,696
Unrealized Losses, Less Than 12 Months | $ 621 |  | $ 3,973
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 19 |  | 33
Fair Value, 12 Months or Greater | $ 41,516 |  | $ 125,728
Unrealized Losses, 12 Months or Greater | $ 838 |  | $ 3,385
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 52 |  | 95
Fair Value, Total | $ 180,224 |  | $ 454,424
Unrealized Losses, Total | $ 1,459 |  | $ 7,358
Other ABS |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 71 |  | 129
Fair Value, Less Than 12 Months | $ 321,040 |  | $ 503,109
Unrealized Losses, Less Than 12 Months | $ 2,958 |  | $ 7,917
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 41 |  | 26
Fair Value, 12 Months or Greater | $ 179,398 |  | $ 89,628
Unrealized Losses, 12 Months or Greater | $ 2,030 |  | $ 983
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 112 |  | 155
Fair Value, Total | $ 500,438 |  | $ 592,737
Unrealized Losses, Total | 4,988 |  | $ 8,900
OTTI Recognized in Earnings |  |  |
Continuous Loss Position, Total |  |  |
Other-than-temporary impairment losses | 0 | $ 844 |
OTTI Recognized in AOCI |  |  |
Continuous Loss Position, Total |  |  |
Other-than-temporary impairment losses | $ 0 | $ 0 |

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