Defined Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Defined Benefit Plan [Abstract]

Schedule of Costs of Retirement Plans

The components of net periodic pension cost for the three and six months ended June 30, 2018 and 2017 are as follows (dollars in thousands):

	Pension Plans
	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service costs	$	280		$	270		$	580		$	550
Interest costs	290			320			590			640
Expected return on plan assets	(420		)	(360		)	(850		)	(730		)
Settlement/curtailment loss	2,500			—			2,500			—
Amortization of net loss	240			250			490			500
Net periodic benefit cost	$	2,890		$	480		$	3,310		$	960