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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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
 
Quarter Ended
Change in benefit obligation:
March 31, 2017
 
March 31, 2016
 
March 31, 2017
 
March 31, 2016
Service cost
$
—

 
$
—

 
$
39

 
$
37

Interest cost
1,841

 
1,893

 
18

 
19

Expected return on plan assets
(2,309
)
 
(2,706
)
 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
(373
)
 
(373
)
Amortization of net loss (gain)
433

 
447

 
(14
)
 
(19
)
Net periodic (benefit) cost
$
(35
)
 
$
(366
)
 
$
(330
)
 
$
(336
)