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Pension Plans and Postretirement Benefit Plan (Tables)
 9 Months Ended
Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016.
 
Pension Benefits
 
Postretirement Benefits
(dollars in thousands)
2017

 
2016

 
2017

 
2016

Three Months Ended September 30,
 

 
 

 
 

 
 

Service Cost
$
—

 
$
—

 
$
123

 
$
137

Interest Cost
1,161

 
1,210

 
272

 
294

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

 
—

Amortization of:
 

 
 

 
 

 
 

Prior Service Credit
—

 
—

 
(81
)
 
(81
)
Net Actuarial Losses (Gains)
433

 
389

 
(111
)
 
(75
)
Net Periodic Benefit Cost
$
356

 
$
317

 
$
203

 
$
275

 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 

 
 

 
 

 
 

Service Cost
$
—

 
$
—

 
$
369

 
$
411

Interest Cost
3,483

 
3,628

 
816

 
882

Expected Return on Plan Assets
(3,714
)
 
(3,844
)
 
—

 
—

Amortization of:
 

 
 

 
 

 
 

Prior Service Credit
—

 
—

 
(242
)
 
(242
)
Net Actuarial Losses (Gains)
1,298

 
1,166

 
(331
)
 
(226
)
Net Periodic Benefit Cost
$
1,067

 
$
950

 
$
612

 
$
825