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Investments in Securities and Fair Value Investments in Securities (Schedule of Unrealized Losses on Investments) (Details) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | (9) | (12)
Special revenue issuer obligations of U.S. states, territories and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,102 | 1,103
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2) | (3)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,102 | 1,103
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2) | (3)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8,493 | 20,630
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13) | (24)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,203 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (35) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 14,696 | 20,630
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (48) | (24)
Total fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8,493 | 20,630
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13) | (24)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7,305 | 1,103
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (37) | (3)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 15,798 | 21,733
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (50) | $ (27)

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