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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands

Dec. 31, 2020

Dec. 31, 2019

Schedule of Held-to-maturity Securities [Line Items]

Aggregate fair value

^[1]

$ 51,312

$ 61,348

Gross unrealized holding gains

604

432

Gross unrealized holding (losses)

(102)

(209)

Amortized cost basis

^[2]

50,810

61,125

Accrued interest on securities

412

538

Current [Member]

Schedule of Held-to-maturity Securities [Line Items]

Aggregate fair value

^[1]

35,608

14,097

Gross unrealized holding gains

265

24

Gross unrealized holding (losses)

(102)

(97)

Amortized cost basis

^[2]

35,445

14,170

Non Current [Member]

Schedule of Held-to-maturity Securities [Line Items]

Aggregate fair value

^[1]

15,704

47,251

Gross unrealized holding gains

339

408

Gross unrealized holding (losses)

(112)

Amortized cost basis

^[2]

$ 15,365

$ 46,955

[1]	Fair value is being determined using quoted market prices in active markets (Level 2).
[2]	Including accrued interest in the amount of US$ 538 thousand and US$ 412 thousand as of December 31, 2019 and 2020, respectively.

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

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-Publisher FASB
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