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Pension Plans and Postretirement Benefit Plan (Tables)
3 Months Ended
Mar. 31, 2015
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, 2015 and 2014.
 
Pension Benefits
 
Postretirement Benefits
(dollars in thousands)
2015

 
2014

 
2015

 
2014

Three Months Ended March 31,
 

 
 

 
 

 
 

Service Cost
$

 
$

 
$
182

 
$
157

Interest Cost
1,186

 
1,242

 
324

 
348

Expected Return on Plan Assets
(1,304
)
 
(1,275
)
 

 

Amortization of:
 

 
 

 
 

 
 

Prior Service Credit

 

 
(81
)
 
(81
)
Net Actuarial Losses (Gains)
443

 
352

 

 
(13
)
Net Periodic Benefit Cost
$
325

 
$
319

 
$
425

 
$
411