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Note 5 - Investments Gain (Loss) on Investments (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
Gain (Loss) on Investments [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security 691   691   332
Other gains $ 23 $ 0 $ 35 $ 18  
Net realized losses on investments (1,088) (1,182) (4,530) (9,361)  
Other than Temporary Impairment Losses, Investments 0 (1,000) (844) (1,000)  
Unrealized gains on trading securities [1] (5,733) 6,938 (18,537) 12,164  
Total net gains on investments (6,821) 4,756 (23,911) 1,803  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 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
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security 77   77   72
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 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
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 768   768   404
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 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
Net gains (losses) on other financial instruments (583) 575 (2,380) 677  
Net Gains (Losses) on Investments and Other Financial Instruments (7,404) 5,331 (26,291) 2,480  
Fixed Maturities [Member]          
Gain (Loss) on Investments [Line Items]          
Available-for-sale Securities, Gross Realized (Loss) Gain, Excluding Other than Temporary Impairments (1,691) (1,180) (4,811) (3,689)  
Equity securities          
Gain (Loss) on Investments [Line Items]          
Equity Securities, Realized Gain (Loss) 498 385 640 385  
Trading Securities [Member]          
Gain (Loss) on Investments [Line Items]          
Trading securities (112) (349) (650) (6,043)  
Unrealized gains on trading securities [2],[3] (5,801) 5,913 (16,801) 7,979  
Short-term Investments [Member]          
Gain (Loss) on Investments [Line Items]          
Short-term investments (7) (38) (7) (32)  
Other investments          
Gain (Loss) on Investments [Line Items]          
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments $ 201 $ 0 $ 263 $ 0  
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 27   27   21
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 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
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 27   27   21
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 78,350   $ 78,350   $ 65,898
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 1,907   $ 1,907   $ 699
[1] These amounts include unrealized gains (losses) on investment securities other than securities available for sale. For the three and six months ended June 30, 2017, the unrealized gains (losses) on investments exclude the net change in unrealized gains and losses on equity securities. Prior to the implementation of the update to the standard for the accounting of financial instruments effective January 1, 2018, the unrealized gains (losses) associated with equity securities were classified in accumulated other comprehensive income.
[2] Includes a de minimis amount of net changes in unrealized gains (losses) related to short-term securities.
[3] Related only to securities still held at period end. All amounts shown are included in net gains (losses) on investments and other financial instruments. Prior to the implementation of the update to the standard for the accounting of financial instruments effective January 1, 2018, the unrealized losses associated with equity securities were classified in accumulated other comprehensive income.