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Pension Benefits and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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
 
Quarter Ended
Change in benefit obligation:
March 31, 2016
 
March 31, 2015
 
March 31, 2016
 
March 31, 2015
Service cost
$
—

 
$
—

 
$
37

 
$
150

Interest cost
1,893

 
1,839

 
19

 
75

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

 
—

Amortization of prior service cost
—

 
—

 
(373
)
 
—

Amortization of net loss (gain)
447

 
413

 
(19
)
 
—

Net periodic benefit (income) cost
$
(366
)
 
$
(519
)
 
$
(336
)
 
$
225