Defined Benefit Pension Plans (Tables)

9 Months Ended

Sep. 30, 2017

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:

	September 30, 2017		December 31, 2016
	(in thousands)
Assets
Plan assets in other long-term assets	$	740	$	654
Liabilities
Current portion of pension benefit obligation in wages and benefits payable	3,497		3,202
Long-term portion of pension benefit obligation	96,849		84,498
Pension benefit obligation, net	$	99,606	$	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 September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	(in thousands)
Service cost	$	994		$	1,003		$	2,846		$	2,930
Interest cost	568			649			1,628			1,932
Expected return on plan assets	(152		)	(139		)	(445		)	(398		)
Settlements and other	—			506			—			499
Amortization of actuarial net loss	431			330			1,225			991
Amortization of unrecognized prior service costs	16			16			46			47
Net periodic benefit cost	$	1,857		$	2,365		$	5,300		$	6,001