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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 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 for the periods indicated were:
(Dollars in thousands)
Pension Benefits
 
Retirement Health and Life Insurance Benefits
Quarter Ended
 
Nine Months Ended
 
Quarter Ended
 
Nine Months Ended
Change in benefit obligation:
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
37

 
$
150

 
$
111

 
$
450

Interest cost
1,872

 
1,846

 
5,658

 
5,523

 
19

 
75

 
57

 
225

Expected return on plan assets
(2,698
)
 
(2,772
)
 
(8,110
)
 
(8,314
)
 
—

 
—

 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
—

 
—

 
(373
)
 
—

 
(1,119
)
 
—

Amortization of net loss (gain)
445

 
432

 
1,339

 
1,258

 
(19
)
 
—

 
(57
)
 
—

Net periodic (benefit) cost
$
(381
)
 
$
(494
)
 
$
(1,113
)
 
$
(1,533
)
 
$
(336
)
 
$
225


$
(1,008
)
 
$
675