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Pension Plans and Postretirement Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit cost
Components of net periodic benefit cost for the Company’s pension plans and the postretirement benefit plan are presented in the following table for the three months ended March 31, 2019 and 2018.
 
Pension Benefits
 
Postretirement Benefits
(dollars in thousands)
2019

 
2018

 
2019

 
2018

Three Months Ended March 31,
 

 
 

 
 

 
 

Service Cost
$
—

 
$
—

 
$
118

 
$
115

Interest Cost
1,094

 
1,041

 
258

 
235

Expected Return on Plan Assets
(1,249
)
 
(1,282
)
 
—

 
—

Amortization of:
 

 
 

 
 

 
 

Prior Service Credit
—

 
—

 
(72
)
 
(142
)
Net Actuarial Losses (Gains)
484

 
498

 
(78
)
 
(62
)
Net Periodic Benefit Cost
$
329

 
$
257

 
$
226

 
$
146