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Fair Value Disclosure - Long-term Investments (Details) - Auction rate security - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Cost Basis $ 1,750 $ 1,750
Gross Unrealized Holding Gains 0 0
Gross Unrealized Holding Losses (179) (179)
Fair Value $ 1,571 $ 1,571