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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, 2020 | Dec. 31, 2019
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Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value |  | $ 12,045
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses |  | (4)
Total temporarily impaired securities, 12 Months or Longer, Fair Value |  | 0
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Total temporarily impaired securities, Total Fair Value |  | 12,045
Total temporarily impaired securities, Unrealized Losses |  | (4)
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 | $ 0 | 1,101
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | 0 | (17)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 1,103 | 1,118
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) | (3)
Total temporarily impaired securities, Total Fair Value | 1,103 | 2,219
Total temporarily impaired securities, Unrealized Losses | (3) | (20)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 20,630 | 413
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (24) | (5)
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 | 20,630 | 413
Total temporarily impaired securities, Unrealized Losses | (24) | (5)
Total fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total temporarily impaired securities, Less than 12 Months, Fair Value | 20,630 | 13,559
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses | (24) | (26)
Total temporarily impaired securities, 12 Months or Longer, Fair Value | 1,103 | 1,118
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) | (3)
Total temporarily impaired securities, Total Fair Value | 21,733 | 14,677
Total temporarily impaired securities, Unrealized Losses | $ (27) | $ (29)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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