Common Shares and Stock Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Feb. 29, 2012 Y	Feb. 28, 2011 Y
Performance Shares - Class A [Member]
Summary of the activity related to performance shares and restricted stock units
Shares, Unvested, Beginning balance	751,500
Weighted-Average Remaining Contractual Term, Beginning Balance	1.0	1.3
Aggregate Intrinsic Value, Beginning balance	$ 16,270
Shares, Credited and Granted
Shares, Vested	(482,500)
Shares, Forfeited	(20,000)
Shares, Unvested, Ending balance	249,000	751,500
Weighted-Average Remaining Contractual Term, Ending Balance	1.0	1.3
Aggregate Intrinsic Value, Ending balance	3,735	16,270
Performance Shares - Class B [Member]
Summary of the activity related to performance shares and restricted stock units
Shares, Unvested, Beginning balance	141,000
Weighted-Average Remaining Contractual Term, Beginning Balance	1.0	1.3
Aggregate Intrinsic Value, Beginning balance	3,053
Shares, Credited and Granted
Shares, Vested	(94,000)
Shares, Forfeited
Shares, Unvested, Ending balance	47,000	141,000
Weighted-Average Remaining Contractual Term, Ending Balance	1.0	1.3
Aggregate Intrinsic Value, Ending balance	705	3,053
Restricted Stock Units - Class A [Member]
Summary of the activity related to performance shares and restricted stock units
Shares, Unvested, Beginning balance	110,749
Weighted-Average Remaining Contractual Term, Beginning Balance	0.6	0.7
Aggregate Intrinsic Value, Beginning balance	2,398
Shares, Credited and Granted	248,416
Shares, Vested	(50,803)
Shares, Forfeited	(16,867)
Shares, Unvested, Ending balance	291,495	110,749
Weighted-Average Remaining Contractual Term, Ending Balance	0.6	0.7
Aggregate Intrinsic Value, Ending balance	4,372	2,398
Restricted Stock Units - Class B [Member]
Summary of the activity related to performance shares and restricted stock units
Shares, Unvested, Beginning balance	29,675
Weighted-Average Remaining Contractual Term, Beginning Balance	1.0	1.1
Aggregate Intrinsic Value, Beginning balance	642
Shares, Credited and Granted	54,870
Shares, Vested	(10,276)
Shares, Forfeited
Shares, Unvested, Ending balance	74,269	29,675
Weighted-Average Remaining Contractual Term, Ending Balance	1.0	1.1
Aggregate Intrinsic Value, Ending balance	$ 1,114	$ 642