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Pension Plans and Postretirement Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2018
Compensation and Retirement Disclosure [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, 2018 and 2017.
 
Pension Benefits
 
Postretirement Benefits
(dollars in thousands)
2018

 
2017

 
2018

 
2017

Three Months Ended March 31,
 

 
 

 
 

 
 

Service Cost
$
—

 
$
—

 
$
115

 
$
123

Interest Cost
1,041

 
1,161

 
235

 
272

Expected Return on Plan Assets
(1,282
)
 
(1,238
)
 
—

 
—

Amortization of:
 

 
 

 
 

 
 

Prior Service Credit
—

 
—

 
(142
)
 
(81
)
Net Actuarial Losses (Gains)
498

 
433

 
(62
)
 
(110
)
Net Periodic Benefit Cost
$
257

 
$
356

 
$
146

 
$
204