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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 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
 
Six Months Ended
 
Three Months Ended
 
Six Months Ended
June 30,
 
June 30,
 
June 30,
 
June 30,
Change in benefit obligation:
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
17

 
$
17

 
$
38

 
$
56

Interest cost
1,692

 
1,841

 
3,372

 
3,682

 
16

 
13

 
31

 
31

Expected return on plan assets
(2,164
)
 
(2,309
)
 
(4,333
)
 
(4,618
)
 
—

 
—

 
—

 
—

Amortization of prior service credit
—

 
—

 
—

 
—

 
(400
)
 
(407
)
 
(801
)
 
(780
)
Amortization of net loss (gain)
457

 
433

 
913

 
866

 
—

 
(17
)
 
—

 
(31
)
Net periodic (benefit) cost
$
(15
)
 
$
(35
)
 
$
(48
)
 
$
(70
)
 
$
(367
)
 
$
(394
)

$
(732
)
 
$
(724
)