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Earnings Per Share (Tables)
 6 Months Ended
May 31, 2018
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):
 
Three Months Ended May 31,
 
Six Months Ended May 31,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
57,308

 
$
31,782

 
$
(13,947
)
 
$
46,041

Less: Distributed earnings allocated to nonvested restricted stock
(12
)
 
(14
)
 
—

 
(29
)
Less: Undistributed earnings allocated to nonvested restricted stock
(310
)
 
(200
)
 
—

 
(285
)
Numerator for basic earnings (loss) per share
56,986

 
31,568

 
(13,947
)
 
45,727

Effect of dilutive securities:
 
 
 
 
 
 
 
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes
796

 
664

 
—

 
1,327

Add: Undistributed earnings allocated to nonvested restricted stock
310

 
200

 
—

 
285

Less: Undistributed earnings reallocated to nonvested restricted stock
(269
)
 
(175
)
 
—

 
(251
)
Numerator for diluted earnings (loss) per share
$
57,823

 
$
32,257

 
$
(13,947
)
 
$
47,088

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding — basic
87,581

 
85,445

 
87,370

 
85,285

Effect of dilutive securities:
 
 
 
 
 
 
 
Share-based payments
5,176

 
3,885

 
—

 
3,288

Convertible senior notes
8,402

 
8,402

 
—

 
8,402

Weighted average shares outstanding — diluted
101,159

 
97,732

 
87,370

 
96,975

Basic earnings (loss) per share
$
.65

 
$
.37

 
$
(.16
)
 
$
.54

Diluted earnings (loss) per share
$
.57

 
$
.33

 
$
(.16
)
 
$
.49