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Earnings (Loss) Per Share (Tables)
 3 Months Ended
Feb. 28, 2014
Earnings Per Share, Basic and Diluted [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Basic and diluted earnings (loss) per share were calculated as follows (in thousands, except per share amounts): 
 
Three Months Ended February 28,
 
2014
 
2013
Numerator:
 
 
 
Net income (loss)
$
10,563

 
$
(12,458
)
Less: Distributed earnings allocated to nonvested restricted stock
(5
)
 
—

Less: Undistributed earnings allocated to nonvested restricted stock
(22
)
 
—

Numerator for basic earnings (loss) per share
10,536

 
(12,458
)
Effect of dilutive securities:
 
 
 
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes
667

 
—

Add: Undistributed earnings allocated to nonvested restricted stock
22

 
—

Less: Undistributed earnings reallocated to nonvested restricted stock
(20
)
 
—

Numerator for diluted earnings (loss) per share
$
11,205

 
$
(12,458
)
Denominator:
 
 
 
Weighted average shares outstanding — basic
83,745

 
79,401

Effect of dilutive securities:
 
 
 
Share-based payments
1,799

 
—

Convertible senior notes
8,402

 
—

Weighted average shares outstanding — diluted
93,946

 
79,401

Basic earnings (loss) per share
$
.13

 
$
(.16
)
Diluted earnings (loss) per share
$
.12

 
$
(.16
)