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Note 5 - Investments Schedule of Unrealized Losses (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) security | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) security | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments | $ 0 | $ 1,000 | $ 844 | $ 1,000 |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 691 |  | 691 |  | 332
Fair value available-for-sale securities | $ 2,736,310 |  | $ 2,736,310 |  | $ 1,338,867
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 69,520 |  | $ 69,520 |  | $ 9,827
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 77 |  | 77 |  | 72
Fair value available-for-sale securities | $ 228,326 |  | $ 228,326 |  | $ 262,531
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 13,205 |  | $ 13,205 |  | $ 6,607
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 768 |  | 768 |  | 404
Fair value available-for-sale securities | $ 2,964,636 |  | $ 2,964,636 |  | $ 1,601,398
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 82,725 |  | 82,725 |  | 16,434
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] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 8 |  | 8 |  | 6
Fair value available-for-sale securities | $ 41,506 |  | $ 41,506 |  | $ 23,309
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,253 |  | $ 1,253 |  | $ 129
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 3 |  | 3 |  | 3
Fair value available-for-sale securities | $ 9,502 |  | $ 9,502 |  | $ 9,799
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 514 |  | $ 514 |  | $ 238
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 11 |  | 11 |  | 9
Fair value available-for-sale securities | $ 51,008 |  | $ 51,008 |  | $ 33,108
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 1,767 |  | $ 1,767 |  | $ 367
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 27 |  | 27 |  | 21
Fair value available-for-sale securities | $ 78,350 |  | $ 78,350 |  | $ 65,898
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,907 |  | $ 1,907 |  | $ 699
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 0 |  | 0 |  | 0
Fair value available-for-sale securities | $ 0 |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0 |  | $ 0
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 27 |  | 27 |  | 21
Fair value available-for-sale securities | $ 78,350 |  | $ 78,350 |  | $ 65,898
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 1,907 |  | $ 1,907 |  | $ 699
Corporate bonds and notes |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 406 |  | 406 |  | 152
Fair value available-for-sale securities | $ 1,548,096 |  | $ 1,548,096 |  | $ 672,318
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 50,572 |  | $ 50,572 |  | $ 4,601
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 29 |  | 29 |  | 32
Fair value available-for-sale securities | $ 119,977 |  | $ 119,977 |  | $ 139,105
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 8,445 |  | $ 8,445 |  | $ 3,451
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 435 |  | 435 |  | 184
Fair value available-for-sale securities | $ 1,668,073 |  | $ 1,668,073 |  | $ 811,423
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 59,017 |  | $ 59,017 |  | $ 8,052
RMBS |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 24 |  | 24 |  | 8
Fair value available-for-sale securities | $ 168,364 |  | $ 168,364 |  | $ 19,943
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,175 |  | $ 2,175 |  | $ 204
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 27 |  | 27 |  | 26
Fair value available-for-sale securities | $ 75,189 |  | $ 75,189 |  | $ 101,812
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 3,744 |  | $ 3,744 |  | $ 2,658
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 51 |  | 51 |  | 34
Fair value available-for-sale securities | $ 243,553 |  | $ 243,553 |  | $ 121,755
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 5,919 |  | $ 5,919 |  | $ 2,862
CMBS |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 76 |  | 76 |  | 35
Fair value available-for-sale securities | $ 436,659 |  | $ 436,659 |  | $ 139,353
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 9,898 |  | $ 9,898 |  | $ 1,395
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 8 |  | 8 |  | 4
Fair value available-for-sale securities | $ 8,222 |  | $ 8,222 |  | $ 3,518
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 384 |  | $ 384 |  | $ 215
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 84 |  | 84 |  | 39
Fair value available-for-sale securities | $ 444,881 |  | $ 444,881 |  | $ 142,871
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 10,282 |  | $ 10,282 |  | $ 1,610
Other ABS |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 124 |  | 124 |  | 92
Fair value available-for-sale securities | $ 423,815 |  | $ 423,815 |  | $ 260,864
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 3,063 |  | $ 3,063 |  | $ 777
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 10 |  | 10 |  | 7
Fair value available-for-sale securities | $ 15,436 |  | $ 15,436 |  | $ 8,297
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 118 |  | $ 118 |  | $ 45
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 134 |  | 134 |  | 99
Fair value available-for-sale securities | $ 439,251 |  | $ 439,251 |  | $ 269,161
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 3,181 |  | $ 3,181 |  | $ 822
Foreign government securities |  |  |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 26 |  | 26 |  | 5
Fair value available-for-sale securities | $ 39,520 |  | $ 39,520 |  | $ 7,397
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 652 |  | $ 652 |  | $ 33
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 0 |  | 0 |  | 0
Fair value available-for-sale securities | $ 0 |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0 |  | $ 0
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 26 |  | 26 |  | 5
Fair value available-for-sale securities | $ 39,520 |  | $ 39,520 |  | $ 7,397
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 652 |  | $ 652 |  | $ 33
Equity securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  | (500) |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security |  |  |  |  | 13
Fair value available-for-sale securities |  |  |  |  | $ 149,785
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  |  |  | $ 1,989
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security |  |  |  |  | 0
Fair value available-for-sale securities |  |  |  |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  |  |  | $ 0
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  |  |  |  | 13
Fair value available-for-sale securities |  |  |  |  | $ 149,785
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  |  |  |  | $ 1,989
Convertible Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  | $ 500 |

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