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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

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-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

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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
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-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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-Name Accounting Standards Codification
-Topic 320
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-Section 50
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+ References

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-SubTopic 10
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