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Deferred Compensation Plan - Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized Cost $ 524 $ 604
Unrealized Gains 112 100
Unrealized Losses 0  
Fair Value 636 704
Mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized Cost 524 604
Unrealized Gains 112 100
Fair Value $ 636 $ 704