Pension and Other Postretirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Pension and Other Postretirement Benefit Plans [Abstract]

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

Amounts recognized for the Dutch Plan in the Consolidated Balance Sheets for the years ended December 31, 2017 and 2016 consist of (in thousands):

	2017			2016
Deferred tax asset	$	2,564		$	2,328
Other long-term liabilities	10,253			9,948
Accumulated other comprehensive loss	(8,162		)	(9,169		)

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The following table summarizes the change in the projected benefit obligation and the fair value of plan assets for the Dutch Plan for the years ended December 31, 2017 and 2016 (in thousands):

	2017			2016
Projected Benefit Obligation:
Projected benefit obligation at beginning of year	$	56,082		$	50,759
Service cost	1,494			1,456
Interest cost	1,121			1,329
Benefits paid	(1,212		)	(1,139		)
Administrative expenses	(35		)	(31		)
Actuarial (gain) loss, net	(1,005		)	5,225
Unrealized (gain) loss on foreign exchange	6,953			(1,517		)
Projected benefit obligation at end of year	$	63,398		$	56,082
Fair Value of Plan Assets:
Fair value of plan assets at beginning of year	$	46,134		$	41,116
Increase in plan asset value	919			6,328
Employer contributions	1,595			1,118
Benefits paid	(1,212		)	(1,139		)
Administrative expenses	(35		)	(31		)
Unrealized gain (loss) on foreign exchange	5,744			(1,258		)
Fair value of plan assets at end of year	$	53,145		$	46,134
Under-funded status of the plan at end of the year	$	(10,253	)	$	(9,948	)
Accumulated Benefit Obligation	$	56,035		$	47,980

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic pension cost for the Dutch Plan under this plan for the years ended December 31, 2017, 2016, and 2015 included (in thousands):

	2017			2016			2015
Service cost	$	1,494		$	1,456		$	1,787
Interest cost	1,121			1,329			1,192
Expected return on plan assets	(950		)	(1,117		)	(986		)
Unrecognized pension asset, net	—			—			(96		)
Prior service cost	(77		)	(81		)	(85		)
Unrecognized net actuarial loss	440			593			727
Net periodic pension cost	$	2,028		$	2,180		$	2,539

Schedule of Assumptions Used [Table Text Block]

The following actuarial assumptions were used to determine the actuarial present value of our projected benefit obligation and the net periodic pension costs for the Dutch Plan at December 31, 2017 and 2016:

	2017	2016
Weighted average assumed discount rate	2.00%	1.90%
Expected long-term rate of return on plan assets	2.00%	1.90%
Weighted average rate of compensation increase	2.90%	2.75%

Schedule of Expected Benefit Payments [Table Text Block]

Expected benefit payments to eligible participants under this plan for the next five years are as follows (in thousands):

2018	$	1,362
2019	$	1,419
2020	$	1,507
2021	$	1,572
2022	$	1,691
Succeeding five years	$	9,808