Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Schedule Of Defined Benefit Plans Disclosures Text Block

The components of net periodic benefit costs, included in other operating expenses on the condensed consolidated statements of income, for the three and nine months ended September 30, 2018 and 2017 were as follows (dollars in thousands):

	Pension Benefits						Other Benefits
	Three months ended September 30,						Three months ended September 30,
	2018			2017			2018			2017
Service cost	$	3,106		$	2,699		$	999		$	465
Interest cost	1,341			1,314			680			459
Expected return on plan assets	(1,884		)	(1,554		)	—			—
Amortization of prior service cost (credit)	82			85			(328		)	(675		)
Amortization of prior actuarial losses	929			1,081			937			580
Settlements	—			256			—			—
Net periodic benefit cost	$	3,574		$	3,881		$	2,288		$	829

	Pension Benefits						Other Benefits
	Nine months ended September 30,						Nine months ended September 30,
	2018			2017			2018			2017
Service cost	$	9,330		$	8,098		$	2,271		$	1,907
Interest cost	4,028			3,943			1,739			1,589
Expected return on plan assets	(5,651		)	(4,662		)	—			—
Amortization of prior service cost (credit)	247			254			(986		)	(986		)
Amortization of prior actuarial losses	2,792			3,244			1,933			1,494
Settlements	—			769			—			—
Net periodic benefit cost	$	10,746		$	11,646		$	4,957		$	4,004