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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Defined Benefit Plan [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic (benefit) cost for the periods indicated were:
 
Pension Benefits
 
Retirement Health and Life Insurance Benefits
(Dollars in thousands)
Three Months Ended
 
Three Months Ended
March 31,
 
March 31,
 
2019
 
2018
 
2019
 
2018
Service cost
$
—

 
$
—

 
$
18

 
$
20

Interest cost
1,784

 
1,680

 
15

 
15

Expected return of plan assets
(2,192
)
 
(2,169
)
 
—

 
—

Amortization of prior service credit
—

 
—

 
(253
)
 
(400
)
Amortization of net loss
454

 
456

 
—

 
—

Net periodic cost (benefit)
$
46

 
$
(33
)
 
$
(220
)
 
$
(365
)