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Earnings Per Share (Tables)
 12 Months Ended
Nov. 30, 2015
Earnings Per Share [Abstract]  
Basic and diluted loss per share
Basic and diluted earnings per share were calculated as follows (in thousands, except per share amounts):
 
Years Ended November 30,
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
Net income
$
84,643

 
$
918,349

 
$
39,963

Less: Distributed earnings allocated to nonvested restricted stock
(33
)
 
(26
)
 
(24
)
Less: Undistributed earnings allocated to nonvested restricted stock
(273
)
 
(2,667
)
 
(90
)
Numerator for basic earnings per share
84,337

 
915,656

 
39,849

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

 
2,667

 
2,230

Add: Undistributed earnings allocated to nonvested restricted stock
273

 
2,667

 
90

Less: Undistributed earnings reallocated to nonvested restricted stock
(244
)
 
(2,398
)
 
(81
)
Numerator for diluted earnings per share
$
87,033

 
$
918,592

 
$
42,088

Denominator:
 
 
 
 
 
Weighted average shares outstanding — basic
92,054

 
89,265

 
82,630

Effect of dilutive securities:
 
 
 
 
 
Share-based payments
2,401

 
1,647

 
1,885

Convertible senior notes
8,402

 
8,402

 
7,044

Weighted average shares outstanding — diluted
102,857

 
99,314

 
91,559

Basic earnings per share
$
.92

 
$
10.26

 
$
.48

Diluted earnings per share
$
.85

 
$
9.25

 
$
.46