Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	$ 49,000	$ 50,000
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	49,000	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)	405	71
Interest rate swap	$ 2,972	$ 5,078