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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014 and 2013 consist of (in thousands):
 
2014
 
2013
Deferred tax asset
$
2,953

 
$
2,488

Other long-term liabilities
11,810

 
9,952

Accumulated other comprehensive loss
(10,812
)
 
(8,626
)
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 years ended December 31, 2014 and 2013 (in thousands):
 
2014
 
2013
Projected Benefit Obligation:
 
 
 

Projected benefit obligation at beginning of year
$
49,456

 
$
46,876

Service cost
1,445

 
1,582

Interest cost
1,756

 
1,676

Prior service cost (credit) arising during year
(1,024
)
 
(583
)
Benefits paid
(1,136
)
 
(1,078
)
Administrative expenses
(220
)
 
(199
)
Actuarial (gain) loss, net
16,667

 
(843
)
Unrealized (gain) loss on foreign exchange
(7,606
)
 
2,025

Projected benefit obligation at end of year
$
59,338

 
$
49,456

 
 
 
 
Fair Value of Plan Assets:
 
 
 
Fair value of plan assets at beginning of year
$
39,504

 
$
38,093

Increase (decrease) in plan asset value
13,572

 
(961
)
Employer contributions
1,897

 
2,028

Benefits paid
(1,136
)
 
(1,078
)
Administrative expenses
(220
)
 
(199
)
Unrealized gain (loss) on foreign exchange
(6,089
)
 
1,621

Fair value of plan assets at end of year
$
47,528

 
$
39,504

 
 
 
 
Under-funded status of the plan at end of the year
$
(11,810
)
 
$
(9,952
)
 
 
 
 
Accumulated Benefit Obligation
$
50,837

 
$
42,871
Schedule of Net Benefit Costs [Table Text Block]
The components of net periodic pension cost under this plan for the years ended December 31, 2014, 2013, and 2012 included (in thousands):
 
2014
 
2013
 
2012
 
 
 
 
 
 
Service cost
$
1,445

 
$
1,582

 
$
1,127

Interest cost
1,756

 
1,676

 
1,684

Expected return on plan assets
(1,303
)
 
(1,291
)
 
(1,214
)
Unrecognized pension asset, net
(87
)
 
(87
)
 
(87
)
Prior service cost
7

 
159

 
159

Unrecognized net actuarial loss
540

 
468

 
—

   Net periodic pension cost
$
2,358

 
$
2,507

 
$
1,669
Schedule of Assumptions Used [Table Text Block]
This net periodic pension cost was calculated using the following assumptions:
 
2014
 
2013
Weighted average assumed discount rate
3.70%
 
3.60%
Expected long-term rate of return on plan assets
3.30%
 
3.30%
Weighted average rate of compensation increase
3.00%
 
3.00%
The following actuarial assumptions were used to determine the actuarial present value of our projected benefit obligation at December 31, 2014 and 2013:
 
2014
 
2013
Weighted average assumed discount rate
2.20%
 
3.70%
Weighted average rate of compensation increase
3.00%
 
3.00%
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):
2015
$
1,047

2016
$
1,151

2017
$
1,292

2018
$
1,343

2019
$
1,366

Succeeding five years
$
8,480