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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Aggregate fair value | [1] | $ 46,862 | $ 13,630
Gross unrealized holding gains |  |  |
Gross unrealized holding (losses) |  | (800) | (144)
Amortized cost basis | [2] | 47,662 | 13,774
Accrued interest on securities |  | 450 | 77
Current [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Aggregate fair value | [1] | 1,588 | 7,749
Gross unrealized holding gains |  |  |
Gross unrealized holding (losses) |  | (22) | (49)
Amortized cost basis | [2] | 1,610 | 7,798
Non Current [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Aggregate fair value | [1] | 45,274 | 5,881
Gross unrealized holding gains |  |  |
Gross unrealized holding (losses) |  | (778) | (95)
Amortized cost basis | [2] | $ 46,052 | $ 5,976
[1] | Fair value is being determined using quoted market prices in active markets (Level 2).
[2] | Including accrued interest in the amount of US$ 77 thousand and US$ 450 thousand as of December 31, 2017 and 2018 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=109979856&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=82897076&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=82897076&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=82897076&loc=d3e27232-111563 + Details
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