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Pension Benefits
3 Months Ended
Sep. 30, 2015
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Pension Benefits
Pension Benefits
We sponsor multiple defined benefit pension plans that covered certain workers under collective bargaining contracts. However, as a result of prior-years’ restructuring activities, for all periods presented, we no longer have any active employees continuing to accrue service cost or otherwise eligible to receive plan benefits. Benefits being paid under the plans are primarily based on negotiated rates and years of service. We contribute to these plans at least the minimum amount required by regulation.
The following table summarizes the components of net periodic benefit income for our pension plans:
 
Three Months Ended 
 September 30,
 
2015
 
2014
Components of net periodic benefit income
 
 
 
Interest cost
$
421

 
$
403

Expected return on plan assets
(630
)
 
(658
)
Amortization of unrecognized net loss
135

 
107

Net periodic benefit income
$
(74
)
 
$
(148
)

For the three months ended September 30, 2015, we made no pension plan contributions and we do not expect to make any contributions to our pension plans during 2016.