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Commitments and Contingencies (Tables)
 6 Months Ended
May 31, 2017
Total Minimum Lease and Easement Commitments under Land use Agreements
The total minimum lease and easement commitments at May 31, 2017 under these land use agreements are as follows:
(in thousands)
2017 (remaining
six months)
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
Total
Land use payments
$
742

 
$
1,329

 
$
1,686

 
$
1,742

 
$
1,782

 
$
56,249

 
$
63,530
Summary of Asset Retirement Obligations
The following table summarizes ARO activity for each of the three and six months ended May 31, 2017 and May 31, 2016, respectively:
 
Three Months Ended
 
Six Months Ended
(in thousands)
May 31, 2017
 
May 31, 2016
 
May 31, 2017
 
May 31, 2016
Balance at the beginning of the period
$
14,129

 
$
10,658

 
$
13,448

 
$
9,992

ARO assumed in acquisition
—

 
981

 
493

 
1,528

Accretion expense
186

 
127

 
357

 
246

Revisions to ARO during the period
4

 
(224
)
 
21

 
(224
)
Balance at the end of the period
$
14,319

 
$
11,542

 
$
14,319

 
$
11,542
Solar Power System Performance Warranty  
Summary of Accrued Warranty Activity
The following table summarizes accrued system output performance warranty activity for the each of three and six months ended May 31, 2017 and May 31, 2016, respectively:
 
Three Months Ended
 
Six Months Ended
(in thousands)
May 31, 2017
 
May 31, 2016
 
May 31, 2017
 
May 31, 2016
Balance at the beginning of the period
$
138

 
$
226

 
$
196

 
$
237

Settlements during the period
(22
)
 
(80
)
 
(51
)
 
(156
)
Adjustments during the period
(52
)
 
(6
)
 
(81
)
 
59

Balance at the end of the period
$
64

 
$
140

 
$
64

 
$
140