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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule Of Defined Benefit Plans Disclosures Text Block
The components of net periodic benefit cost, included in other operating expenses on the condensed consolidated statements of income, for the three months ended March 31, 2018 and 2017 were as follows (dollars in thousands):
 
 
Pension Benefits
 
Other Benefits
 
 
Three months ended March 31,
 
Three months ended March 31,
 
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
2,654

 
$
2,580

 
$
636

 
$
721

Interest cost
 
1,330

 
1,198

 
530

 
565

Expected return on plan assets
 
(1,554
)
 
(1,285
)
 
—

 
—

Amortization of prior service cost (credit)
 
83

 
74

 
(329
)
 
(156
)
Amortization of prior actuarial losses
 
1,094

 
1,081

 
498

 
457

Settlements
 
—

 
257

 
—

 
—

Net periodic benefit cost
 
$
3,607

 
$
3,905

 
$
1,335

 
$
1,587