Employee Benefit Plans

6 Months Ended

Jun. 30, 2018

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 six months ended June 30, 2018 and 2017 were as follows (dollars in thousands):

	Pension Benefits						Other Benefits
	Three months ended June 30,						Three months ended June 30,
	2018			2017			2018			2017
Service cost	$	3,570		$	2,819		$	636		$	721
Interest cost	1,357			1,431			529			565
Expected return on plan assets	(2,213		)	(1,823		)	—			—
Amortization of prior service cost (credit)	82			95			(329		)	(155		)
Amortization of prior actuarial losses	769			1,082			498			457
Settlements	—			256			—			—
Net periodic benefit cost	$	3,565		$	3,860		$	1,334		$	1,588

	Pension Benefits						Other Benefits
	Six months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service cost	$	6,224		$	5,399		$	1,272		$	1,442
Interest cost	2,687			2,629			1,059			1,130
Expected return on plan assets	(3,767		)	(3,108		)	—			—
Amortization of prior service cost (credit)	165			169			(658		)	(311		)
Amortization of prior actuarial losses	1,863			2,163			996			914
Settlements	—			513			—			—
Net periodic benefit cost	$	7,172		$	7,765		$	2,669		$	3,175

The Company made $5.0 million in pension contributions during the first six months of 2018 and expects to make total pension contributions between $8.0 million and $10.0 million in 2018.