Employee Benefit Plans

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Employee Benefit Plans

Employee Benefit Plans

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, 2019 and 2018 were as follows (dollars in thousands):

	Pension Benefits						Other Benefits
	Three months ended September 30,						Three months ended September 30,
	2019			2018			2019			2018
Service cost	$	3,158		$	3,106		$	461		$	999
Interest cost	1,662			1,341			827			680
Expected return on plan assets	(1,788		)	(1,884		)	—			—
Amortization of prior service cost (credit)	61			82			(328		)	(328		)
Amortization of prior actuarial losses	1,073			929			29			937
Net periodic benefit cost	$	4,166		$	3,574		$	989		$	2,288

	Pension Benefits						Other Benefits
	Nine months ended September 30,						Nine months ended September 30,
	2019			2018			2019			2018
Service cost	$	9,465		$	9,330		$	1,975		$	2,271
Interest cost	4,979			4,028			1,986			1,739
Expected return on plan assets	(5,364		)	(5,651		)	—			—
Amortization of prior service cost (credit)	182			247			(986		)	(986		)
Amortization of prior actuarial losses	3,215			2,792			1,317			1,933
Net periodic benefit cost	$	12,477		$	10,746		$	4,292		$	4,957