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Earnings (Loss) Per Share (Tables)
 9 Months Ended
Aug. 31, 2014
Earnings Per Share, Basic and Diluted [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Basic and diluted earnings per share were calculated as follows (in thousands, except per share amounts): 
 
 
Nine Months Ended August 31,
 
Three Months Ended August 31,
 
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
 
Net income
 
$
65,548

 
$
11,847

 
$
28,361

 
$
27,278

Less: Distributed earnings allocated to nonvested restricted stock
 
(18
)
 
(18
)
 
(6
)
 
(6
)
Less: Undistributed earnings allocated to nonvested restricted stock
 
(159
)
 
(16
)
 
(73
)
 
(73
)
Numerator for basic earnings per share
 
65,371

 
11,813

 
28,282

 
27,199

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes
 
2,000

 
—

 
667

 
667

Add: Undistributed earnings allocated to nonvested restricted stock
 
159

 
16

 
73

 
73

Less: Undistributed earnings reallocated to nonvested restricted stock
 
(142
)
 
(14
)
 
(66
)
 
(65
)
Numerator for diluted earnings per share
 
$
67,388

 
$
11,815

 
$
28,956

 
$
27,874

Denominator:
 
 
 
 
 
 
 
 
Weighted average shares outstanding — basic
 
88,389

 
82,261

 
91,793

 
83,714

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Share-based payments
 
1,823

 
2,028

 
1,875

 
1,931

Convertible senior notes
 
8,402

 
—

 
8,402

 
8,402

Weighted average shares outstanding — diluted
 
98,614

 
84,289

 
102,070

 
94,047

Basic earnings per share
 
$
.74

 
$
.14

 
$
.31

 
$
.32

Diluted earnings per share
 
$
.68

 
$
.14

 
$
.28

 
$
.30