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Investments in Securities and Fair Value Investments in Securities (Schedule of Unrealized Losses on Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | $ 1,016 | $ 1,042
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (7) | (1)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 0 | 0
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total temporarily impaired securities, Total Fair Value | 1,016 | 1,042
Total temporarily impaired securities, Unrealized Losses | (7) | (1)
General obligations of U.S. states, territories and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 4,888 | 4,560
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (32) | (27)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 6,469 | 3,535
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (111) | (23)
Total temporarily impaired securities, Total Fair Value | 11,357 | 8,095
Total temporarily impaired securities, Unrealized Losses | (143) | (50)
Special revenue issuer obligations of U.S. states, territories and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 12,326 | 13,551
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (100) | (61)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 9,720 | 4,023
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (229) | (104)
Total temporarily impaired securities, Total Fair Value | 22,046 | 17,574
Total temporarily impaired securities, Unrealized Losses | (329) | (165)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 4,490 | 3,744
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (28) | (7)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 3,733 | 0
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (19) | 0
Total temporarily impaired securities, Total Fair Value | 8,223 | 3,744
Total temporarily impaired securities, Unrealized Losses | (47) | (7)
Total fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 22,720 | 22,897
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (167) | (96)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 19,922 | 7,558
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (359) | (127)
Total temporarily impaired securities, Total Fair Value | 42,642 | 30,455
Total temporarily impaired securities, Unrealized Losses | $ (526) | $ (223)

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