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Pension Plans and Postretirement Benefit Plan (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2017 and 2016.
 
Pension Benefits
 
Postretirement Benefits
(dollars in thousands)
2017

 
2016

 
2017

 
2016

Three Months Ended June 30,
 

 
 

 
 

 
 

Service Cost
$
—

 
$
—

 
$
123

 
$
137

Interest Cost
1,161

 
1,209

 
272

 
294

Expected Return on Plan Assets
(1,238
)
 
(1,281
)
 
—

 
—

Amortization of:
 

 
 

 
 

 
 

Prior Service Credit
—

 
—

 
(80
)
 
(80
)
Net Actuarial Losses (Gains)
432

 
388

 
(110
)
 
(76
)
Net Periodic Benefit Cost
$
355

 
$
316

 
$
205

 
$
275

 
 
 
 
 
 
 
 
Six Months Ended June 30,
 

 
 

 
 

 
 

Service Cost
$
—

 
$
—

 
$
246

 
$
274

Interest Cost
2,322

 
2,418

 
544

 
588

Expected Return on Plan Assets
(2,476
)
 
(2,562
)
 
—

 
—

Amortization of:
 

 
 

 
 

 
 

Prior Service Credit
—

 
—

 
(161
)
 
(161
)
Net Actuarial Losses (Gains)
865

 
777

 
(220
)
 
(151
)
Net Periodic Benefit Cost
$
711

 
$
633

 
$
409

 
$
550