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Pension Benefits and Other Postretirement Benefit Plans
 3 Months Ended
Mar. 31, 2017
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
 
Quarter Ended
Change in benefit obligation:
March 31, 2017
 
March 31, 2016
 
March 31, 2017
 
March 31, 2016
Service cost
$
—

 
$
—

 
$
39

 
$
37

Interest cost
1,841

 
1,893

 
18

 
19

Expected return on plan assets
(2,309
)
 
(2,706
)
 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
(373
)
 
(373
)
Amortization of net loss (gain)
433

 
447

 
(14
)
 
(19
)
Net periodic (benefit) cost
$
(35
)
 
$
(366
)
 
$
(330
)
 
$
(336
)

Employer Contributions
In the first three months of 2017 and 2016, we made required contributions of $0.1 million to our qualified defined benefit pension plans and did not make any voluntary contributions.
At December 31, 2016 we had met the minimum funding requirements for all of our qualified defined benefit pension plans due to a required contribution of $0.3 million to the pension plan that covers employees at our Bear, Delaware facility. We estimate that we will be required to make a contribution of $0.3 million in 2017.
As there is no funding requirement for the non-qualified defined benefit pension plans or the retiree health and life insurance benefit plans, benefit payments made during the year are funded directly by the Company.