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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Nov. 30, 2014
Earnings Per Share [Abstract]  
Basic and diluted loss per share
Basic and diluted earnings (loss) per share were calculated as follows (in thousands, except per share amounts):
 
Years Ended November 30,
 
2014
 
2013
 
2012
Numerator:
 
 
 
 
 
Net income (loss)
$
918,349

 
$
39,963

 
$
(58,953
)
Less: Distributed earnings allocated to nonvested restricted stock
(26
)
 
(24
)
 
—

Less: Undistributed earnings allocated to nonvested restricted stock
(2,667
)
 
(90
)
 
—

Numerator for basic earnings (loss) per share
915,656

 
39,849

 
(58,953
)
Effect of dilutive securities:
 
 
 
 
 
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes
2,667

 
2,230

 
—

Add: Undistributed earnings allocated to nonvested restricted stock
2,667

 
90

 
—

Less: Undistributed earnings reallocated to nonvested restricted stock
(2,398
)
 
(81
)
 
—

Numerator for diluted earnings (loss) per share
$
918,592

 
$
42,088

 
$
(58,953
)
Denominator:
 
 
 
 
 
Weighted average shares outstanding — basic
89,265

 
82,630

 
77,106

Effect of dilutive securities:
 
 
 
 
 
Share-based payments
1,647

 
1,885

 
—

Convertible senior notes
8,402

 
7,044

 
—

Weighted average shares outstanding — diluted
99,314

 
91,559

 
77,106

Basic earnings (loss) per share
$
10.26

 
$
.48

 
$
(.76
)
Diluted earnings (loss) per share
$
9.25

 
$
.46

 
$
(.76
)