Investment Securities Available for Sale (Maturity Dates of Marketable Debt Securities) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	$ 30,642
Under 1 Year	0
1 Year up to 5 Years	30,642
More than 5 Years	0
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	36,687
Under 1 Year	4,364
1 Year up to 5 Years	32,173
More than 5 Years	150
U.S. mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	6,500
Under 1 Year	0
1 Year up to 5 Years	36
More than 5 Years	6,464
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	1,398
Under 1 Year	0
1 Year up to 5 Years	0
More than 5 Years	1,398
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Market Value	8,980
Under 1 Year	8,980
1 Year up to 5 Years	0
More than 5 Years	0
Index-linked U.S. bonds
Schedule of Available-for-sale Securities [Line Items]
Market Value	770
Under 1 Year	0
1 Year up to 5 Years	770
More than 5 Years	0
Foreign fixed-income securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	501
Under 1 Year	0
1 Year up to 5 Years	501
More than 5 Years	0
Total marketable debt securities by maturity dates
Schedule of Available-for-sale Securities [Line Items]
Market Value	85,478
Under 1 Year	13,344
1 Year up to 5 Years	64,122
More than 5 Years	$ 8,012

Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Available-for-sale Securities, Debt Maturities, after Five Years, Fair Value

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