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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
May 31, 2013
Accounting Policies [Abstract]  
Changes in Asset Retirement Obligations
Changes in asset retirement obligations are as follows:
 
 
 
May 31,
 
May 31,
In thousands
 
2013
 
2012
Balance at beginning of period
 
$
3,879

 
$
4,455

Additions
 
80

 
287

Accretion expense
 
175

 
175

Settlements
 
(1,481
)
 
(1,038
)
Balance at end of period
 
$
2,653

 
$
3,879
Calculation of Basic and Diluted EPS
Basic and Diluted EPS are calculated as follows:
 
In thousands except per share
 
2013
 
2012
 
2011
Earnings
 
 
 
 
 
 
Net income (loss) from continuing operations
 
$
(10,494
)
 
$
1,928

 
$
(69,472
)
Net income from discontinued operations
 
35,044

 
5,548

 
4,559

Unvested restricted share and unit participation
 
—

 
(3
)
 
31

Income (loss) allocated to common shareholders
 
$
24,550

 
$
7,473

 
$
(64,882
)
Shares
 
 
 
 
 
 
Weighted-average shares outstanding
 
28,175

 
27,927

 
27,836

Contingently issuable shares
 
4

 
2

 
2

Unvested restricted shares
 
(16
)
 
(15
)
 
(13
)
Basic weighted-average shares
 
28,163

 
27,914

 
27,825

Stock option, restricted share, unit, and award dilution
 
—

 
102

 
—

Diluted weighted-average shares (1)
 
28,163

 
28,016

 
27,825

Net income (loss) from continuing operations
 
 
 
 
 
 
Basic
 
$
(0.37
)
 
$
0.07

 
$
(2.49
)
Diluted
 
$
(0.37
)
 
$
0.07

 
$
(2.49
)
Net income (loss) from discontinued operations
 
 
 
 
 
 
Basic
 
$
1.24

 
$
0.20

 
$
0.16

Diluted
 
$
1.24

 
$
0.20

 
$
0.16

Net income (loss) per share
 
 
 
 
 
 
Basic
 
$
0.87

 
$
0.27

 
$
(2.33
)
Diluted
 
$
0.87

 
$
0.27

 
$
(2.33
)
(1)    Shares excluded due to antidilutive effect of stock options, restricted shares and awards
 
807

 
1,280

 
1,032