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Investments in Securities and Fair Value Investments in Securities (Schedule of Gross Unrealized Gains and Losses and Amortized Cost for Securities) (Details) $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Government obligations |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | $ 1,023 | $ 1,043
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 7 | 1
Available-for-sale, at fair value, Estimated Fair Value | 1,016 | 1,042
General obligations of U.S. states, territories and political subdivisions |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | 19,518 | 24,189
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 229 | 505
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 143 | 50
Available-for-sale, at fair value, Estimated Fair Value | 19,604 | 24,644
Special revenue issuer obligations of U.S. states, territories and political subdivisions |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | 56,675 | 62,592
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,237 | 2,218
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 329 | 165
Available-for-sale, at fair value, Estimated Fair Value | $ 57,583 | $ 64,645
Number of Special Revenue Bonds | 60 | 60
Corporate debt securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | $ 10,498 | $ 12,490
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 303 | 527
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 47 | 7
Available-for-sale, at fair value, Estimated Fair Value | 10,754 | 13,010
Total fixed maturity securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fixed maturities, available-for-sale, amortized cost | 87,714 | 100,314
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,769 | 3,250
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 526 | 223
Available-for-sale, at fair value, Estimated Fair Value | $ 88,957 | $ 103,341

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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