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Pension Benefits and Other Postretirement Benefit Plans
 6 Months Ended
Jun. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Pension Benefit and Other Postretirement Benefit Plans
Pension Benefits and Other Postretirement Benefit Plans
Components of Net Periodic (Benefit) Cost
The components of net periodic benefit cost (income) for the periods indicated were:
(Dollars in thousands)
Pension Benefits
 
Retirement Health and Life Insurance Benefits
Quarter Ended
 
Six Months Ended
 
Quarter Ended
 
Six Months Ended
Change in benefit obligation:
June 30, 2016
 
June 30, 2015
 
June 30, 2016
 
June 30, 2015
 
June 30, 2016
 
June 30, 2015
 
June 30, 2016
 
June 30, 2015
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
37

 
$
150

 
$
74

 
$
300

Interest cost
1,893

 
1,838

 
3,786

 
3,677

 
19

 
75

 
38

 
150

Expected return on plan assets
(2,706
)
 
(2,771
)
 
(5,412
)
 
(5,542
)
 
—

 
—

 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
—

 
—

 
(373
)
 
—

 
(746
)
 
—

Amortization of net loss (gain)
447

 
413

 
894

 
826

 
(19
)
 
—

 
(38
)
 
—

Net periodic (benefit) cost
$
(366
)
 
$
(520
)
 
$
(732
)
 
$
(1,039
)
 
$
(336
)
 
$
225


$
(672
)
 
$
450


Employer Contributions
In the first three and six months of 2016, we did not make any voluntary contributions to our qualified defined benefit pension plans. In the second quarter of 2015, we made voluntary contributions of $6.5 million to our qualified defined benefit pension plans.
As of December 31, 2015, we had not met the minimum funding requirement for all of our defined benefit pension plans and were therefore required to make a contribution to one of the plans of $0.1 million and $0.2 million during the three and six months ended June 30, 2016. We did not make any contributions during the three and six months ended June 30, 2015. We estimate that we will be required to make contributions of $0.3 million in 2016.
As there is no funding requirement for the non-qualified defined benefit pension plans nor the Retiree Health and Life Insurance benefit plans, benefit payments made during the year are funded directly by the Company.