Summary Of Significant Accounting Policies (Tables)

6 Months Ended

Nov. 30, 2011

Summary Of Significant Accounting Policies [Abstract]

Schedule Of Asset Retirement Obligations

		Six months ended November 30,
In thousands		2011			2010
Balance at beginning of period	$		4,455	$		4,474
Additions			287			9
Accretion expense			89			107
Settlements			(713)			(169)
Balance at end of period	$		4,118	$		4,421

Schedule Of Earnings Per Share Basic And Diluted

	Three months ended November 30,						Six months ended November 30,
In thousands except per share	2011			2010			2011			2010
Earnings
Net loss	$	(21,037	)	$	(11,201	)	$	(28,457	)	$	(34,893	)
Unvested restricted share participation		9			4			14			16
Loss allocated to common shareholders	$	(21,028	)	$	(11,197	)	$	(28,443	)	$	(34,877	)
Shares
Weighted-average shares outstanding		27,892			27,815			27,890			27,807
Contingently issuable shares		2			2			2			2
Unvested restricted shares		(12	)		(10	)		(14	)		(12	)
Basic weighted-average shares		27,882			27,807			27,878			27,797
Stock option, restricted share and award dilution		--			--			--			--
Diluted weighted-average shares (1)		27,882			27,807			27,878			27,797
Net loss per share
Basic	$	(.75	)	$	(.40	)	$	(1.02	)	$	(1.25	)
Diluted	$	(.75	)	$	(.40	)	$	(1.02	)	$	(1.25	)
(1)    Shares excluded due to antidilutive effect          Stock options, restricted shares and awards		1,514			1,246			1,359			1,230