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Fair Value of Financial Instruments (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Fair Value of Financial Instruments [Abstract] |  |
Investment maturity term | 1 year |
Impairment charge, Held-to-maturity Securities | $ 0 | $ 0

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- Definition Investment maturity term + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings and other comprehensive income (OCI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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