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Statements of Operations-Additional Information
 9 Months Ended
Mar. 31, 2015
Supplemental Income Statement Elements [Abstract]  
Statements of Operations-Additional Information
4.     Statements of Operations—Additional Information
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​ ​ ​
Three Months
 ​ ​
Nine Months
 ​
For the Periods Ended March 31
 ​ ​
2015
 ​ ​
2014
 ​ ​
2015
 ​ ​
2014
 ​
Depreciation and amortization ​ ​ ​ ​ ​
Depreciation of property, plant and equipment
 ​ ​ ​ $ 4,066 ​ ​ ​ ​ $ 3,920 ​ ​ ​ ​ $ 12,417 ​ ​ ​ ​ $ 11,878 ​ ​
Amortization of intangible assets
 ​ ​ ​ ​ 1,233 ​ ​ ​ ​ ​ 1,202 ​ ​ ​ ​ ​ 3,359 ​ ​ ​ ​ ​ 3,737 ​ ​
Amortization of other assets
 ​ ​ ​ ​ 57 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 174 ​ ​ ​ ​ ​ — ​ ​
​ ​ ​ ​ $ 5,356 ​ ​ ​ ​ $ 5,122 ​ ​ ​ ​ $ 15,950 ​ ​ ​ ​ $ 15,615 ​ ​
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