Benefit Plans (Tables)
 6 Months Ended
May 31, 2016
U.S Pension Plan [Member]  
Item Effected [Line Items]  
Components of Net Periodic Pension (Benefit) Cost
The components of net periodic pension cost (income) for our pension plans are as follows (in thousands):
 
Three Months Ended May 31,
 
Six Months Ended May 31,
U.S. Pension Plan
2016
 
2015
 
2016
 
2015
Components of net periodic pension cost (income):
 
 
 
 
 
 
 
Service cost
$
100

 
$
63

 
$
200

 
$
126

Interest cost on projected benefit obligation
587

 
585

 
1,174

 
1,170

Expected return on plan assets
(684
)
 
(848
)
 
(1,460
)
 
(1,696
)
Net periodic pension cost (income)
$
3

 
$
(200
)
 
$
(86
)

$
(400
)
German Pension Plan [Member]  
Item Effected [Line Items]  
Components of Net Periodic Pension (Benefit) Cost
 
Three Months Ended May 31,
 
Six Months Ended May 31,
German Pension Plan
2016
 
2015
 
2016
 
2015
Components of net periodic pension cost:
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
$
135

 
$
127

 
$
265

 
$
263

Net amortization
83

 
79

 
163

 
163

Net periodic pension cost
$
218

 
$
206

 
$
428

 
$
426