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Pension, Savings, And Other Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
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)
 
2020
 
2019
 
2020
 
2019
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
Service cost
 
$
8

 
$
8

 
$
25

 
$
24

Interest cost
 
5,909

 
7,575

 
304

 
351

Expected return on plan assets
 
(6,168
)
 
(9,173
)
 
(311
)
 
(269
)
Amortization of unrecognized:
 
 
 
 
 
 
 
 
Prior service cost/(credit)
 
—

 
—

 
8

 
—

Actuarial (gain)/loss
 
3,224

 
2,435

 
(75
)
 
(117
)
Net periodic benefit cost/(credit)
 
$
2,973

 
$
845

 
$
(49
)
 
$
(11
)