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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Aug. 31, 2013
Changes in Asset Retirement Obligations
Changes in asset retirement obligations are as follows:
 
 
 
Three months ended
 
 
August 31,
 
August 31,
In thousands
 
2013
 
2012
Balance at beginning of period
 
$
2,653

 
$
3,879

Additions
 
—

 
45

Accretion expense
 
30

 
42

Settlements
 
—

 
(1,617
)
Balance at end of period
 
$
2,683

 
$
2,349
Calculation of Basic and Diluted EPS
Basic and Diluted EPS are calculated as follows:
 
 
 
Three months ended
 
 
August 31,
 
August 31,
In thousands except per share
 
2013
 
2012
Earnings
 
 
 
 
Net income (loss) from continuing operations
 
$
429

 
$
(7,396
)
Net income from discontinued operations
 
—

 
4,738

Unvested restricted share participation
 
—

 
—

Income (Loss) allocated to common shareholders
 
$
429

 
$
(2,658
)
Shares
 
 
 
 
Weighted-average shares outstanding
 
28,587

 
28,013

Contingently issuable shares
 
5

 
3

Unvested restricted shares
 
(14
)
 
(18
)
Basic weighted-average shares
 
28,578

 
27,998

Stock option, restricted share, restricted share units and award dilution
 
476

 
—

Diluted weighted-average shares (1)
 
29,054

 
27,998

Net Income (loss) per share from continuing operations
 
 
 
 
Basic
 
$
0.02

 
$
(0.26
)
Diluted
 
$
0.01

 
$
(0.26
)
Net income per share from discontinued operations
 
 
 
 
Basic
 
$
—

 
$
0.18

Diluted
 
$
—

 
$
0.18

Net income (loss) per share
 
 
 
 
Basic
 
$
0.02

 
$
(0.08
)
Diluted
 
$
0.01

 
$
(0.08
)
(1)    Shares excluded due to antidilutive effect of stock options, restricted shares and awards
 
160

 
1,131