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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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
 
Six Months Ended
 
Quarter Ended
 
Six Months Ended
Change in benefit obligation:
June 30, 2017
 
June 30, 2016
 
June 30, 2017
 
June 30, 2016
 
June 30, 2017
 
June 30, 2016
 
June 30, 2017
 
June 30, 2016
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
17

 
$
37

 
$
56

 
$
74

Interest cost
1,841

 
1,893

 
3,682

 
3,786

 
13

 
19

 
31

 
38

Expected return on plan assets
(2,309
)
 
(2,706
)
 
(4,618
)
 
(5,412
)
 
—

 
—

 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
—

 
—

 
(407
)
 
(373
)
 
(780
)
 
(746
)
Amortization of net loss (gain)
433

 
447

 
866

 
894

 
(17
)
 
(19
)
 
(31
)
 
(38
)
Net periodic (benefit) cost
$
(35
)
 
$
(366
)
 
$
(70
)
 
$
(732
)
 
$
(394
)
 
$
(336
)

$
(724
)
 
$
(672
)