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Commitments and Contingencies (Tables)
 9 Months Ended
Aug. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Changes in the Warranty Liability
The changes in our warranty liability were as follows (in thousands):
 
Three Months Ended August 31,
 
Nine Months Ended August 31,
 
2018
 
2017
 
2018
 
2017
Balance at beginning of period
$
76,404

 
$
60,037

 
$
69,798

 
$
56,682

Warranties issued
9,590

 
10,041

 
27,243

 
25,965

Payments
(6,023
)
 
(6,267
)
 
(17,070
)
 
(18,836
)
Balance at end of period
$
79,971

 
$
63,811

 
$
79,971

 
$
63,811
Schedule of Self-Insurance Liability
The changes in our self-insurance liability were as follows (in thousands):
 
Three Months Ended August 31,
 
Nine Months Ended August 31,
 
2018
 
2017
 
2018
 
2017
Balance at beginning of period
$
176,715

 
$
156,505

 
$
177,695

 
$
158,584

Self-insurance expense (a)
5,554

 
5,573

 
14,264

 
13,811

Payments 
(2,473
)
 
(2,291
)
 
(5,115
)
 
(7,051
)
Adjustments (b)
(1,023
)
 
17,772

 
(8,071
)
 
12,215

Balance at end of period
$
178,773

 
$
177,559

 
$
178,773

 
$
177,559

(a)
These expenses are included in selling, general and administrative expenses and are largely offset by contributions from subcontractors participating in the wrap-up policy.
(b)
The amount for each period reflects changes in our self-insurance liability that were offset by changes in the receivable for estimated probable insurance and other recoveries to present our self-insurance liability on a gross basis. The amounts for the three months and nine months ended August 31, 2017 also included a $21.7 million change in estimate to increase our self-insurance liability based on an actuarially determined estimate that we believed had a higher probability of being adequate to cover future payments associated with unresolved claims, including claims incurred but not yet reported.