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Fair Value Measurement (Cash and Short term Investments) (Details) - Short-term Investments - Corporate Bond Securities - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost $ 11,406 $ 20,286
Gross Unrealized Gains 436 2
Gross Unrealized (Losses) (3) (14)
Estimated Fair Value $ 11,839 $ 20,274