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Employee Benefit Plans
 9 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
8.     Employee Benefit Plans
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The Company maintains a noncontributory defined benefit pension plan for all domestic nonunion employees employed on or prior to December 31, 2013, who meet certain requirements of age, length of service and hours worked per year. Plan benefits are based upon years of service and average compensation, as defined within the plan.
The following table details the net periodic pension expense:
​ ​ ​
Three Months
 ​ ​
Nine Months
 ​
For the Periods Ended March 31
 ​ ​
2015
 ​ ​
2014
 ​ ​
2015
 ​ ​
2014
 ​
Service cost – benefits earned during the period
 ​ ​ ​ $ 739 ​ ​ ​ ​ $ 535 ​ ​ ​ ​ $ 2,217 ​ ​ ​ ​ $ 1,843 ​ ​
Interest cost on benefit obligation
 ​ ​ ​ ​ 654 ​ ​ ​ ​ ​ 532 ​ ​ ​ ​ ​ 1,963 ​ ​ ​ ​ ​ 1,750 ​ ​
Expected return on plan assets
 ​ ​ ​ ​ (707) ​ ​ ​ ​ ​ (476) ​ ​ ​ ​ ​ (2,121) ​ ​ ​ ​ ​ (1,751) ​ ​
Amortization of net actuarial loss and prior service costs
 ​ ​ ​ ​ 351 ​ ​ ​ ​ ​ 249 ​ ​ ​ ​ ​ 1,053 ​ ​ ​ ​ ​ 678 ​ ​
Net periodic pension expense
 ​ ​ ​ $ 1,037 ​ ​ ​ ​ $ 840 ​ ​ ​ ​ $ 3,112 ​ ​ ​ ​ $ 2,520 ​ ​
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