Defined Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Defined Benefit Plan [Abstract]

Schedule of components of net periodic pension cost

Components of net periodic pension cost are as follows (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Service cost	$	251		$	295		$	737		$	883
Interest cost	59			62			172			185
Expected return on plan assets	(258		)	(296		)	(757		)	(885		)
Prior service cost amortization	38			38			113			113
Deferred loss amortization	—			61			—			183
Net periodic pension cost	$	90		$	160		$	265		$	479

Net cost related to employee severance

Components of net cost related to the Korea employee defined benefit plan are as follows (in thousands):

	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017
Service cost	$	134	$	221
Interest cost	20		34
Net cost	$	154	$	255