Investment Securities (Maturity Dates of Marketable Debt Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Market Value	$ 91,204	$ 83,445
U.S. Government securities
Debt Securities, Available-for-sale [Line Items]
Market Value	19,200
Under 1 Year	16,000
1 Year up to 5 Years	3,200
More than 5 Years	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Market Value	52,434
Under 1 Year	27,812
1 Year up to 5 Years	24,622
More than 5 Years	0
U.S. mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	10,484
Under 1 Year	2,882
1 Year up to 5 Years	7,602
More than 5 Years	0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Market Value	9,086
Under 1 Year	9,086
1 Year up to 5 Years	0
More than 5 Years	0
Marketable debt securities
Debt Securities, Available-for-sale [Line Items]
Market Value	91,204
Under 1 Year	55,780
1 Year up to 5 Years	35,424
More than 5 Years	$ 0

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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