Defined Benefit Pension Plans (Tables)

3 Months Ended

Mar. 31, 2017

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

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

Amounts recognized on the Consolidated Balance Sheets consist of:

	March 31, 2017		December 31, 2016
	(in thousands)
Assets
Plan assets in other long-term assets	$	702	$	654
Liabilities
Current portion of pension benefit obligation in wages and benefits payable	3,281		3,202
Long-term portion of pension benefit obligation	87,663		84,498
Pension benefit obligation, net	$	90,242	$	87,046

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,
	2017			2016
	(in thousands)
Service cost	$	928		$	986
Interest cost	525			633
Expected return on plan assets	(146		)	(126		)
Settlements and other	—			(3		)
Amortization of actuarial net loss	391			327
Amortization of unrecognized prior service costs	15			15
Net periodic benefit cost	$	1,713		$	1,832