Investment Securities At Fair Value (Maturity Dates of Marketable Debt Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Market Value	$ 84,252	$ 84,814
Under 1 Year	28,831
1 Year up to 5 Years	55,421
More than 5 Years	0
U.S. Government securities
Debt Securities, Available-for-sale [Line Items]
Market Value	28,311
Under 1 Year	11,215
1 Year up to 5 Years	17,096
More than 5 Years	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Market Value	42,858
Under 1 Year	9,124
1 Year up to 5 Years	33,734
More than 5 Years	0
U.S. mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	3,194
Under 1 Year	771
1 Year up to 5 Years	2,423
More than 5 Years	0
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	407
Under 1 Year	0
1 Year up to 5 Years	407
More than 5 Years	0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Market Value	5,992
Under 1 Year	5,992
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	2,345
Under 1 Year	1,576
1 Year up to 5 Years	769
More than 5 Years	0
Foreign fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Market Value	1,145
Under 1 Year	153
1 Year up to 5 Years	992
More than 5 Years	$ 0

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