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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
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
 
Nine Months Ended
 
Three Months Ended
 
Nine Months Ended
September 30,
 
September 30,
 
September 30,
 
September 30,
Change in benefit obligation:
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
17

 
$
12

 
$
55

 
$
68

Interest cost
1,692

 
1,837

 
5,064

 
5,519

 
16

 
20

 
47

 
51

Expected return of plan assets
(2,164
)
 
(2,302
)
 
(6,497
)
 
(6,920
)
 
—

 
—

 
—

 
—

Amortization of prior service credit
—

 
—

 
—

 
—

 
(400
)
 
(411
)
 
(1,201
)
 
(1,191
)
Amortization of net loss (gain)
457

 
445

 
1,370

 
1,311

 
—

 
16

 
—

 
(15
)
Net periodic (benefit) cost
$
(15
)
 
$
(20
)
 
$
(63
)
 
$
(90
)
 
$
(367
)
 
$
(363
)

$
(1,099
)
 
$
(1,087
)