Pension Plans and Postretirement Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2014
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, 2014 and 2013.
 
Pension Benefits
 
Postretirement Benefits
(dollars in thousands)
2014

 
2013

 
2014

 
2013

Three Months Ended March 31,
 

 
 

 
 

 
 

Service Cost
$
—

 
$
—

 
$
157

 
$
32

Interest Cost
1,242

 
1,128

 
348

 
57

Expected Return on Plan Assets
(1,275
)
 
(1,313
)
 
—

 
—

Amortization of:
 

 
 

 
 

 
 

Prior Service Credit
—

 
—

 
(81
)
 
(80
)
Net Actuarial Losses
352

 
414

 
(13
)
 
—

Net Periodic Benefit Cost
$
319

 
$
229

 
$
411

 
$
9