Investment Securities Available for Sale (Maturity Dates of Marketable Debt Securities) (Details) $ in Thousands	Jun. 30, 2016 USD ($)
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	$ 27,456
Under 1 Year	0
1 Year up to 5 Years	27,456
More than 5 Years	0
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	35,660
Under 1 Year	2,271
1 Year up to 5 Years	33,389
More than 5 Years	0
U.S. mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	7,343
Under 1 Year	0
1 Year up to 5 Years	49
More than 5 Years	7,294
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	3,675
Under 1 Year	0
1 Year up to 5 Years	0
More than 5 Years	3,675
U.S. asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	2,115
Under 1 Year	0
1 Year up to 5 Years	2,115
More than 5 Years	0
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Market Value	7,985
Under 1 Year	7,985
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	793
Under 1 Year	0
1 Year up to 5 Years	793
More than 5 Years	0
Total marketable debt securities by maturity dates
Schedule of Available-for-sale Securities [Line Items]
Market Value	85,027
Under 1 Year	10,256
1 Year up to 5 Years	63,802
More than 5 Years	$ 10,969

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

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