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Fair Value Measurements (Tables)
 6 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of fair value of derivative instruments based upon pricing models
As of
 ​ ​
December 31, 2015
 ​ ​
June 30, 2015
 ​
​ ​ ​
Level 1
 ​ ​
Level 2
 ​ ​
Level 3
 ​ ​
Level 1
 ​ ​
Level 2
 ​ ​
Level 3
 ​
Derivatives
 ​ ​ ​ $  — ​ ​ ​ ​ $ (4,536) ​ ​ ​ ​ $ — ​ ​ ​ ​ $  — ​ ​ ​ ​ $ (1,542) ​ ​ ​ ​ $ — ​ ​
Deferred consideration on acquisitions
 ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 5,958 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 5,465 ​ ​
Schedule of changes in the fair value of Level 3 assets
​
Balance, June 30, 2015
 ​ ​ ​ $ 5,465 ​ ​
​
Acquisition related accrued interest
 ​ ​ ​ ​ 689 ​ ​
​
Payment and other
 ​ ​ ​ ​ (196) ​ ​
​
Balance, December 31, 2015
 ​ ​ ​ $ 5,958 ​ ​
​