Defined Benefit Pension Plans (Tables)

9 Months Ended

Sep. 30, 2016

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:

	September 30, 2016		December 31, 2015
	(in thousands)
Assets
Plan assets in other long-term assets	$	609	$	359
Liabilities
Current portion of pension benefit obligation in wages and benefits payable	2,581		3,493
Long-term portion of pension benefit obligation	86,310		85,971
Pension benefit obligation, net	$	88,282	$	89,105

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,
	2016			2015			2016			2015
	(in thousands)
Service cost	$	1,003		$	904		$	2,930		$	3,162
Interest cost	649			595			1,932			1,820
Expected return on plan assets	(139		)	(122		)	(398		)	(387		)
Settlements and other	506			375			499			374
Amortization of actuarial net loss	330			488			991			1,470
Amortization of unrecognized prior service costs	16			14			47			43
Net periodic benefit cost	$	2,365		$	2,254		$	6,001		$	6,482