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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Defined Benefit Plan [Abstract]  
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 September 30,
 
Nine Months Ended September 30,
 
Quarter Ended September 30,
 
Nine Months Ended September 30,
Change in benefit obligation:
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
12

 
$
37

 
$
68

 
$
111

Interest cost
1,837

 
1,872

 
5,519

 
5,658

 
20

 
19

 
51

 
57

Expected return on plan assets
(2,302
)
 
(2,698
)
 
(6,920
)
 
(8,110
)
 
—

 
—

 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
—

 
—

 
(411
)
 
(373
)
 
(1,191
)
 
(1,119
)
Amortization of net loss (gain)
445

 
445

 
1,311

 
1,339

 
16

 
(19
)
 
(15
)
 
(57
)
Net periodic (benefit) cost
$
(20
)
 
$
(381
)
 
$
(90
)
 
$
(1,113
)
 
$
(363
)
 
$
(336
)

$
(1,087
)
 
$
(1,008
)