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Note 5 - Investments Gain (Loss) on Investments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) security
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 269 |  | 269 |  | 362
Other gains | $ 7 | $ 15 | $ 25 | $ 33 |
Net realized losses on investments | (32) | 7,893 | (9,393) | 3,901 |
Other than Temporary Impairment Losses, Investments | 0 | 0 | (1,000) | 0 |
Unrealized gains on trading securities | 2,353 | (47) | 14,517 | 62,862 |
Total net gains on investments | 2,321 | 7,846 | 4,124 | 66,763 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,029,555 |  | 1,029,555 |  | $ 1,566,440
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 10,002 |  | $ 10,002 |  | $ 37,941
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 16 |  | 16 |  | 21
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 30,150 |  | $ 30,150 |  | $ 58,451
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 814 |  | $ 814 |  | $ 842
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 285 |  | 285 |  | 383
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 1,059,705 |  | $ 1,059,705 |  | $ 1,624,891
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 10,816 |  | 10,816 |  | $ 38,783
Net gains (losses) on other financial instruments | 159 | (135) | 836 | 2,761 |
Net Gains (Losses) on Investments and Other Financial Instruments | 2,480 | 7,711 | 4,960 | 69,524 |
Fixed Maturities [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments | 137 | 5,685 | (3,552) | 3,703 |
Equity securities |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments | 33 | 0 | 418 | (170) |
Trading Securities [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Trading securities | (223) | 1,524 | (6,266) | (295) |
Short-term Investments [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Short-term investments | 14 | 38 | (18) | (1) |
Other investments |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments | $ 0 | $ 631 | $ 0 | $ 631 |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 17 |  | 17 |  | 7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 60,210 |  | $ 60,210 |  | $ 30,901
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 439 |  | $ 439 |  | $ 821
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 0 |  | 0 |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0 |  | $ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 17 |  | 17 |  | 7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 60,210 |  | $ 60,210 |  | $ 30,901
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 439 |  | $ 439 |  | $ 821

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