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Fair Value Measurements (Tables)
 3 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of fair value derivatives, assets and liabilities
As of
 ​ ​
September 30, 2018
 ​ ​
June 30, 2018
 ​
​ ​ ​
Level 1
 ​ ​
Level 2
 ​ ​
Level 1
 ​ ​
Level 2
 ​
Short-term investments
 ​ ​ ​ $ 50,000 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 50,000 ​ ​ ​ ​ $ — ​ ​
Derivatives asset (liability)
 ​ ​ ​ $ — ​ ​ ​ ​ $ (60) ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 71 ​ ​
Interest rate swap
 ​ ​ ​ $ — ​ ​ ​ ​ $ 5,728 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 5,078 ​ ​
There were no Level 3 fair value measurements for the periods presented.