Investment Securities At Fair Value (Maturity Dates of Marketable Debt Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Market Value	$ 94,567	$ 84,367
Under 1 Year	46,103
1 Year up to 5 Years	48,464
More than 5 Years	0
U.S. Government securities
Debt Securities, Available-for-sale [Line Items]
Market Value	17,543
Under 1 Year	7,090
1 Year up to 5 Years	10,453
More than 5 Years	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Market Value	50,159
Under 1 Year	20,328
1 Year up to 5 Years	29,831
More than 5 Years	0
U.S. mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	10,361
Under 1 Year	3,053
1 Year up to 5 Years	7,308
More than 5 Years	0
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	388
Under 1 Year	24
1 Year up to 5 Years	364
More than 5 Years	0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Market Value	13,934
Under 1 Year	13,934
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	1,174
Under 1 Year	1,174
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	1,008
Under 1 Year	500
1 Year up to 5 Years	508
More than 5 Years	$ 0

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