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Fair Value Measurement (Cash and Short term Investments) (Details) - Short-term Investments - Corporate Bond Securities - USD ($)
$ in Thousands
Mar. 31, 2016
Jun. 30, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost $ 13,442 $ 20,286
Gross Unrealized Gains 5 2
Gross Unrealized (Losses) (439) (14)
Estimated Fair Value $ 13,008 $ 20,274