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Statements of Operations-Additional Information
 6 Months Ended
Dec. 31, 2014
Supplemental Income Statement Elements [Abstract]  
Statements of Operations-Additional Information
4.
Statements of Operations—Additional Information
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​ ​ ​
Three Months
 ​ ​
Six Months
 ​
For the Periods Ended December 31
 ​ ​
2014
 ​ ​
2013
 ​ ​
2014
 ​ ​
2013
 ​
Depreciation and amortization ​ ​ ​ ​ ​
Depreciation of property, plant and equipment
 ​ ​ ​ $ 4,123 ​ ​ ​ ​ $ 4,106 ​ ​ ​ ​ $ 8,351 ​ ​ ​ ​ $ 7,958 ​ ​
Amortization of intangible assets
 ​ ​ ​ ​ 1,057 ​ ​ ​ ​ ​ 1,186 ​ ​ ​ ​ ​ 2,126 ​ ​ ​ ​ ​ 2,535 ​ ​
Amortization of other assets
 ​ ​ ​ ​ 61 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 117 ​ ​ ​ ​ ​ — ​ ​
​ ​ ​ ​ $ 5,241 ​ ​ ​ ​ $ 5,292 ​ ​ ​ ​ $ 10,594 ​ ​ ​ ​ $ 10,493 ​ ​
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