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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components of net periodic benefit cost
The components of net periodic benefit cost (income) 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, 2016
 
June 30, 2015
 
June 30, 2016
 
June 30, 2015
 
June 30, 2016
 
June 30, 2015
 
June 30, 2016
 
June 30, 2015
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
37

 
$
150

 
$
74

 
$
300

Interest cost
1,893

 
1,838

 
3,786

 
3,677

 
19

 
75

 
38

 
150

Expected return on plan assets
(2,706
)
 
(2,771
)
 
(5,412
)
 
(5,542
)
 
—

 
—

 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
—

 
—

 
(373
)
 
—

 
(746
)
 
—

Amortization of net loss (gain)
447

 
413

 
894

 
826

 
(19
)
 
—

 
(38
)
 
—

Net periodic (benefit) cost
$
(366
)
 
$
(520
)
 
$
(732
)
 
$
(1,039
)
 
$
(336
)
 
$
225


$
(672
)
 
$
450