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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments $ 50,000 $ 50,000
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 50,000 50,000
Derivatives asset (liability) 0 0
Interest rate swap 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Derivatives asset (liability) (60) 71
Interest rate swap $ 5,728 $ 5,078