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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, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) security
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 636 |  | 636 |  | 332
Fair Value, Less Than 12 Months | $ 2,790,951 |  | $ 2,790,951 |  | $ 1,338,867
Unrealized Losses, Less Than 12 Months | $ 64,321 |  | $ 64,321 |  | $ 9,827
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 101 |  | 101 |  | 72
Fair Value, 12 Months or Greater | $ 314,131 |  | $ 314,131 |  | $ 262,531
Unrealized Losses, 12 Months or Greater | $ 18,449 |  | $ 18,449 |  | $ 6,607
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 737 |  | 737 |  | 404
Fair Value, Total | $ 3,105,082 |  | $ 3,105,082 |  | $ 1,601,398
Unrealized Losses, Total | 82,770 |  | 82,770 |  | 16,434
Other than Temporary Impairment Losses, Investments | 900 | $ 0 | 1,744 | $ 1,000 |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  | 0 |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 0 |  | $ 0 |  | $ 0
US government and agency securities |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 9 |  | 9 |  | 6
Fair Value, Less Than 12 Months | $ 39,342 |  | $ 39,342 |  | $ 23,309
Unrealized Losses, Less Than 12 Months | $ 1,944 |  | $ 1,944 |  | $ 129
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 5 |  | 5 |  | 3
Fair Value, 12 Months or Greater | $ 11,758 |  | $ 11,758 |  | $ 9,799
Unrealized Losses, 12 Months or Greater | $ 780 |  | $ 780 |  | $ 238
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 14 |  | 14 |  | 9
Fair Value, Total | $ 51,100 |  | $ 51,100 |  | $ 33,108
Unrealized Losses, Total | $ 2,724 |  | $ 2,724 |  | $ 367
State and municipal obligations |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 25 |  | 25 |  | 21
Fair Value, Less Than 12 Months | $ 76,914 |  | $ 76,914 |  | $ 65,898
Unrealized Losses, Less Than 12 Months | $ 2,166 |  | $ 2,166 |  | $ 699
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 6 |  | 6 |  | 0
Fair Value, 12 Months or Greater | $ 13,172 |  | $ 13,172 |  | $ 0
Unrealized Losses, 12 Months or Greater | $ 584 |  | $ 584 |  | $ 0
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 31 |  | 31 |  | 21
Fair Value, Total | $ 90,086 |  | $ 90,086 |  | $ 65,898
Unrealized Losses, Total | $ 2,750 |  | $ 2,750 |  | $ 699
Corporate bonds and notes |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 383 |  | 383 |  | 152
Fair Value, Less Than 12 Months | $ 1,619,774 |  | $ 1,619,774 |  | $ 672,318
Unrealized Losses, Less Than 12 Months | $ 43,840 |  | $ 43,840 |  | $ 4,601
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 35 |  | 35 |  | 32
Fair Value, 12 Months or Greater | $ 157,323 |  | $ 157,323 |  | $ 139,105
Unrealized Losses, 12 Months or Greater | $ 10,634 |  | $ 10,634 |  | $ 3,451
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 418 |  | 418 |  | 184
Fair Value, Total | $ 1,777,097 |  | $ 1,777,097 |  | $ 811,423
Unrealized Losses, Total | $ 54,474 |  | $ 54,474 |  | $ 8,052
RMBS |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 23 |  | 23 |  | 8
Fair Value, Less Than 12 Months | $ 169,259 |  | $ 169,259 |  | $ 19,943
Unrealized Losses, Less Than 12 Months | $ 3,271 |  | $ 3,271 |  | $ 204
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 28 |  | 28 |  | 26
Fair Value, 12 Months or Greater | $ 80,158 |  | $ 80,158 |  | $ 101,812
Unrealized Losses, 12 Months or Greater | $ 4,829 |  | $ 4,829 |  | $ 2,658
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 51 |  | 51 |  | 34
Fair Value, Total | $ 249,417 |  | $ 249,417 |  | $ 121,755
Unrealized Losses, Total | $ 8,100 |  | $ 8,100 |  | $ 2,862
CMBS |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 78 |  | 78 |  | 35
Fair Value, Less Than 12 Months | $ 423,684 |  | $ 423,684 |  | $ 139,353
Unrealized Losses, Less Than 12 Months | $ 10,098 |  | $ 10,098 |  | $ 1,395
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 11 |  | 11 |  | 4
Fair Value, 12 Months or Greater | $ 26,830 |  | $ 26,830 |  | $ 3,518
Unrealized Losses, 12 Months or Greater | $ 1,389 |  | $ 1,389 |  | $ 215
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 89 |  | 89 |  | 39
Fair Value, Total | $ 450,514 |  | $ 450,514 |  | $ 142,871
Unrealized Losses, Total | $ 11,487 |  | $ 11,487 |  | $ 1,610
Other ABS |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security | 118 |  | 118 |  | 92
Fair Value, Less Than 12 Months | $ 461,978 |  | $ 461,978 |  | $ 260,864
Unrealized Losses, Less Than 12 Months | $ 3,002 |  | $ 3,002 |  | $ 777
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Number of Securities, 12 Months or Greater | security | 16 |  | 16 |  | 7
Fair Value, 12 Months or Greater | $ 24,890 |  | $ 24,890 |  | $ 8,297
Unrealized Losses, 12 Months or Greater | $ 233 |  | $ 233 |  | $ 45
Continuous Loss Position, Total |  |  |  |  |
Number of Securities, Total | security | 134 |  | 134 |  | 99
Fair Value, Total | $ 486,868 |  | $ 486,868 |  | $ 269,161
Unrealized Losses, Total | $ 3,235 |  | $ 3,235 |  | $ 822
Foreign government and agency securities |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security |  |  |  |  | 5
Fair Value, Less Than 12 Months |  |  |  |  | $ 7,397
Unrealized Losses, Less Than 12 Months |  |  |  |  | $ 33
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 |  |  |  |  | 5
Fair Value, Total |  |  |  |  | $ 7,397
Unrealized Losses, Total |  |  |  |  | $ 33
Equity securities |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Number of Securities, Less than 12 Months | security |  |  |  |  | 13
Fair Value, Less Than 12 Months |  |  |  |  | $ 149,785
Unrealized Losses, Less Than 12 Months |  |  |  |  | $ 1,989
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 |  |  |  |  | 13
Fair Value, Total |  |  |  |  | $ 149,785
Unrealized Losses, Total |  |  |  |  | $ 1,989
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  | 500 |
Convertible Debt Securities [Member] |  |  |  |  |
Continuous Loss Position, Total |  |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  | $ 500 |

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