Investment Securities At Fair Value (Maturity Dates of Marketable Debt Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Market Value	$ 83,445	$ 84,367
U.S. Government securities
Debt Securities, Available-for-sale [Line Items]
Market Value	14,660
Under 1 Year	4,914
1 Year up to 5 Years	9,746
More than 5 Years	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Market Value	54,413
Under 1 Year	25,824
1 Year up to 5 Years	28,589
More than 5 Years	0
U.S. mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	6,816
Under 1 Year	3,337
1 Year up to 5 Years	3,479
More than 5 Years	0
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	382
Under 1 Year	382
1 Year up to 5 Years	0
More than 5 Years	0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Market Value	5,887
Under 1 Year	5,887
1 Year up to 5 Years	0
More than 5 Years	0
Index-linked U.S. bonds
Debt Securities, Available-for-sale [Line Items]
Market Value	779
Under 1 Year	779
1 Year up to 5 Years	0
More than 5 Years	0
Foreign fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Market Value	508
Under 1 Year	0
1 Year up to 5 Years	508
More than 5 Years	0
Marketable debt securities
Debt Securities, Available-for-sale [Line Items]
Market Value	83,445
Under 1 Year	41,123
1 Year up to 5 Years	42,322
More than 5 Years	$ 0

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