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Pension Benefits and Other Postretirement Benefit Plans
 9 Months Ended
Sep. 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 for the periods indicated were:
(Dollars in thousands)
Pension Benefits
 
Retirement Health and Life Insurance Benefits
Quarter Ended
 
Nine Months Ended
 
Quarter Ended
 
Nine Months Ended
Change in benefit obligation:
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
37

 
$
150

 
$
111

 
$
450

Interest cost
1,872

 
1,846

 
5,658

 
5,523

 
19

 
75

 
57

 
225

Expected return on plan assets
(2,698
)
 
(2,772
)
 
(8,110
)
 
(8,314
)
 
—

 
—

 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
—

 
—

 
(373
)
 
—

 
(1,119
)
 
—

Amortization of net loss (gain)
445

 
432

 
1,339

 
1,258

 
(19
)
 
—

 
(57
)
 
—

Net periodic (benefit) cost
$
(381
)
 
$
(494
)
 
$
(1,113
)
 
$
(1,533
)
 
$
(336
)
 
$
225


$
(1,008
)
 
$
675


Employer Contributions
In the first nine months of 2016, we did not make any voluntary contributions to our qualified defined benefit pension plans. In the first nine months of 2015, we made voluntary contributions of $6.5 million to our qualified defined benefit pension plans. The 2015 voluntary contribution was made during the second quarter.
As of December 31, 2015, we had not met the minimum funding requirement for all of our qualified defined benefit pension plans and were therefore required to make a contribution to one of the plans of $0.1 million and $0.3 million during the three and nine months ended September 30, 2016. We did not make any contributions during the three and nine months ended September 30, 2015. We estimate that we will be required to make total 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.