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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Nov. 30, 2013
Changes in Asset Retirement Obligations
Changes in asset retirement obligations are as follows:
 
 
Six months ended
 
 
November 30,
 
November 30,
In thousands
 
2013
 
2012
Balance at beginning of period
 
$
2,653

 
$
3,879

Additions
 
—

 
305

Accretion expense
 
72

 
86

Settlements
 
(10
)
 
(1,617
)
Balance at end of period
 
$
2,715

 
$
2,653
Calculation of Basic and Diluted EPS
Basic and diluted EPS are calculated as follows:

 
 
Three months ended
 
Six months ended
 
 
November 30,
 
November 30,
 
November 30,
 
November 30,
In thousands except per share
 
2013
 
2012
 
2013
 
2012
Earnings
 
 
 
 
 
 
 
 
Net loss from continuing operations
 
$
(17,640
)
 
$
(10,189
)
 
$
(17,210
)
 
$
(17,583
)
Net income (loss) from discontinued operations
 
$
—

 
$
(933
)
 
$
—

 
$
3,805

Loss allocated to common shareholders
 
$
(17,640
)
 
$
(11,122
)
 
$
(17,210
)
 
$
(13,778
)
Shares
 
 
 
 
 
 
 
 
Weighted-average shares outstanding
 
28,615

 
28,043

 
28,601

 
28,028

Contingently issuable shares
 
6

 
3

 
6

 
3

Unvested restricted shares
 
(7
)
 
(16
)
 
(11
)
 
(17
)
Basic weighted-average shares
 
28,614

 
28,030

 
28,596

 
28,014

Diluted weighted-average shares (1)
 
28,614

 
28,030

 
28,596

 
28,014

Net loss per share from continuing operations
 
 
 
 
 
 
 
 
Basic
 
$
(0.62
)
 
$
(0.36
)
 
$
(0.60
)
 
$
(0.63
)
Diluted
 
$
(0.62
)
 
$
(0.36
)
 
$
(0.60
)
 
$
(0.63
)
Net income (loss) per share from discontinued operations
 
 
 
 
 
 
 
 
Basic
 
$
—

 
$
(0.04
)
 
$
—

 
$
0.14

Diluted
 
$
—

 
$
(0.04
)
 
$
—

 
$
0.14

Net loss per share
 
 
 
 
 
 
 
 
Basic
 
$
(0.62
)
 
$
(0.40
)
 
$
(0.60
)
 
$
(0.49
)
Diluted
 
$
(0.62
)
 
$
(0.40
)
 
$
(0.60
)
 
$
(0.49
)
(1)    Shares excluded due to antidilutive effect of stock options, restricted shares and awards
 
542

 
826

 
550

 
978