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Pensions and Post-retirement Benefits (Tables)
 6 Months Ended
May 31, 2014
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Our net periodic pension expense (income) for the three and six months ended May 31, 2014 and 2013 was comprised of the following (in thousands): 
 
Three months ended May 31,
 
Six months ended May 31,
 
2014
 
2013
 
2014
 
2013
Service costs incurred
$
3,048

 
$
2,608

 
$
6,093

 
$
5,206

Interest costs on projected benefit obligation
2,140

 
1,768

 
4,241

 
3,461

Expected return on plan assets
(2,134
)
 
(1,903
)
 
(4,224
)
 
(3,724
)
Amortization of prior service credit
(338
)
 
(336
)
 
(676
)
 
(672
)
Amortization of transitional obligation
11

 
—

 
22

 
—

Net periodic pension expense
$
2,727

 
$
2,137

 
$
5,456

 
$
4,271

Our net periodic postretirement expense was comprised of the following for the three and six months ended May 31, 2014 and 2013 (in thousands):
 
Three months ended May 31,
 
Six months ended May 31,
 
2014
 
2013
 
2014
 
2013
Service costs incurred
$
4

 
$
5

 
$
8

 
$
11

Interest costs
103

 
100

 
206

 
200

Net periodic postretirement expense
$
107

 
$
105

 
$
214

 
$
211