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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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
 
Six Months Ended
 
Three Months Ended
 
Six Months Ended
June 30,
 
June 30,
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
18

 
$
17

 
$
36

 
$
38

Interest cost
1,785

 
1,692

 
3,569

 
3,372

 
15

 
16

 
30

 
31

Expected return of plan assets
(2,192
)
 
(2,164
)
 
(4,384
)
 
(4,333
)
 
—

 
—

 
—

 
—

Amortization of prior service credit
—

 
—

 
—

 
—

 
(253
)
 
(400
)
 
(506
)
 
(801
)
Amortization of net loss
456

 
457

 
910

 
913

 
—

 
—

 
—

 
—

Net periodic cost (benefit)
$
49

 
$
(15
)
 
$
95

 
$
(48
)
 
$
(220
)
 
$
(367
)

$
(440
)
 
$
(732
)