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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Aggregate fair value | [1] | $ 61,348 | $ 46,862
Gross unrealized holding gains |  | 432 |
Gross unrealized holding (losses) |  | (209) | (800)
Amortized cost basis | [2] | 61,125 | 47,662
Accrued interest on securities |  | 538 | 450
Current [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Aggregate fair value | [1] | 14,097 | 1,588
Gross unrealized holding gains |  | 24 |
Gross unrealized holding (losses) |  | (97) | (22)
Amortized cost basis | [2] | 14,170 | 1,610
Non Current [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Aggregate fair value | [1] | 47,251 | 45,274
Gross unrealized holding gains |  | 408 |
Gross unrealized holding (losses) |  | (112) | (778)
Amortized cost basis | [2] | $ 46,955 | $ 46,052
[1] | Fair value is being determined using quoted market prices in active markets (Level 2).
[2] | Including accrued interest in the amount of US$ 450 thousand and US$ 538 thousand as of December 31, 2018 and 2019 respectively.

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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