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Pension, Savings, And Other Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits, Description [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the three months ended March 31 are as follows:
 
 
 
Pension Benefits
 
Other Benefits
(Dollars in thousands)
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
Service cost
 
$
8

 
$
10

 
$
24

 
$
33

Interest cost
 
7,575

 
6,986

 
351

 
327

Expected return on plan assets
 
(9,173
)
 
(8,225
)
 
(269
)
 
(269
)
Amortization of unrecognized:
 
 
 
 
 
 
 
 
Actuarial (gain)/loss
 
2,435

 
2,956

 
(117
)
 
(91
)
Net periodic benefit cost/(credit)
 
$
845

 
$
1,727

 
$
(11
)
 
$
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