Defined Benefit Pension Plans (Tables)

6 Months Ended

Jun. 30, 2018

Defined Benefit Plan [Abstract]

Schedule of Amounts Recognized in the Consolidated Balance Sheets

Amounts recognized on the Consolidated Balance Sheets consist of:

	June 30, 2018		December 31, 2017
	(in thousands)
Assets
Plan assets in other long-term assets	$	938	$	991
Liabilities
Current portion of pension benefit obligation in wages and benefits payable	3,123		3,260
Long-term portion of pension benefit obligation	94,386		95,717
Pension benefit obligation, net	$	96,571	$	97,986

Schedule of Net Periodic Pension Benefit Costs

Net periodic pension benefit costs for our plans include the following components:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Service cost	$	968		$	924		$	2,017		$	1,852
Interest cost	591			535			1,200			1,060
Expected return on plan assets	(169		)	(147		)	(350		)	(293		)
Amortization of actuarial net loss	392			403			795			794
Amortization of unrecognized prior service costs	17			15			34			30
Net periodic benefit cost	$	1,799		$	1,730		$	3,696		$	3,443