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Earnings (Loss) Per Share (Tables)
 6 Months Ended
May 31, 2014
Earnings Per Share, Basic and Diluted [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Basic and diluted earnings (loss) per share were calculated as follows (in thousands, except per share amounts): 
 
 
Six Months Ended May 31,
 
Three Months Ended May 31,
 
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
 
Net income (loss)
 
$
37,187

 
$
(15,431
)
 
$
26,624

 
$
(2,973
)
Less: Distributed earnings allocated to nonvested restricted stock
 
(12
)
 
—

 
(6
)
 
—

Less: Undistributed earnings allocated to nonvested restricted stock
 
(88
)
 
—

 
(66
)
 
—

Numerator for basic earnings (loss) per share
 
37,087

 
(15,431
)
 
26,552

 
(2,973
)
Effect of dilutive securities:
 
 
 
 
 
 
 
 
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes
 
1,333

 
—

 
667

 
—

Add: Undistributed earnings allocated to nonvested restricted stock
 
88

 
—

 
66

 
—

Less: Undistributed earnings reallocated to nonvested restricted stock
 
(80
)
 
—

 
(59
)
 
—

Numerator for diluted earnings (loss) per share
 
$
38,428

 
$
(15,431
)
 
$
27,226

 
$
(2,973
)
Denominator:
 
 
 
 
 
 
 
 
Weighted average shares outstanding — basic
 
86,668

 
81,526

 
89,529

 
83,605

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Share-based payments
 
1,689

 
—

 
1,577

 
—

Convertible senior notes
 
8,402

 
—

 
8,402

 
—

Weighted average shares outstanding — diluted
 
96,759

 
81,526

 
99,508

 
83,605

Basic earnings (loss) per share
 
$
.43

 
$
(.19
)
 
$
.30

 
$
(.04
)
Diluted earnings (loss) per share
 
$
.40

 
$
(.19
)
 
$
.27

 
$
(.04
)