Defined Benefit Pension Plans (Tables)

3 Months Ended

Mar. 31, 2018

Defined Benefit Plan [Abstract]

Schedule of Amounts Recognized in the Consolidated Balance Sheets [Table Text Block]

Amounts recognized on the Consolidated Balance Sheets consist of:

	March 31, 2018		December 31, 2017
	(in thousands)
Assets
Plan assets in other long-term assets	$	1,054	$	991
Liabilities
Current portion of pension benefit obligation in wages and benefits payable	3,291		3,260
Long-term portion of pension benefit obligation	100,045		95,717
Pension benefit obligation, net	$	102,282	$	97,986

Schedule of Net Periodic Pension Benefit Costs [Table Text Block]

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

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Service cost	$	1,049		$	928
Interest cost	609			525
Expected return on plan assets	(181		)	(146		)
Amortization of actuarial net loss	403			391
Amortization of unrecognized prior service costs	17			15
Net periodic benefit cost	$	1,897		$	1,713

The components of net periodic benefit cost, other than the service cost component, are included in total other income (expense) on the Consolidated Statements of Operations.