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Commitments and Contingencies (Tables)
 6 Months Ended
May 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Changes in the Warranty Liability
The changes in our warranty liability are as follows (in thousands):
 
Six Months Ended May 31,
 
Three Months Ended May 31,
 
2013
 
2012
 
2013
 
2012
Balance at beginning of period
$
47,822

 
$
67,693

 
$
43,333

 
$
64,607

Warranties issued
6,319

 
2,973

 
3,553

 
1,656

Payments
(18,213
)
 
(8,703
)
 
(9,284
)
 
(4,267
)
Adjustments
17,547

 
(11,097
)
 
15,873

 
(11,130
)
Balance at end of period
$
53,475

 
$
50,866

 
$
53,475

 
$
50,866