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Earnings Per Share (Tables)
 6 Months Ended
May. 31, 2015
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): 
 
Six Months Ended May 31,
 
Three Months Ended May 31,
 
2015
 
2014
 
2015
 
2014
Numerator:
 
 
 
 
 
 
 
Net income
$
17,372

 
$
37,187

 
$
9,573

 
$
26,624

Less: Distributed earnings allocated to nonvested restricted stock
(16
)
 
(12
)
 
(8
)
 
(6
)
Less: Undistributed earnings allocated to nonvested restricted stock
(45
)
 
(88
)
 
(24
)
 
(66
)
Numerator for basic earnings per share
17,311

 
37,087

 
9,541

 
26,552

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

 
1,333

 
667

 
667

Add: Undistributed earnings allocated to nonvested restricted stock
45

 
88

 
24

 
66

Less: Undistributed earnings reallocated to nonvested restricted stock
(41
)
 
(80
)
 
(22
)
 
(59
)
Numerator for diluted earnings per share
$
18,648

 
$
38,428

 
$
10,210

 
$
27,226

Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding — basic
91,974

 
86,668

 
91,995

 
89,529

Effect of dilutive securities:
 
 
 
 
 
 
 
Share-based payments
1,094

 
1,689

 
1,147

 
1,577

Convertible senior notes
8,402

 
8,402

 
8,402

 
8,402

Weighted average shares outstanding — diluted
101,470

 
96,759

 
101,544

 
99,508

Basic earnings per share
$
.19

 
$
.43

 
$
.10

 
$
.30

Diluted earnings per share
$
.18

 
$
.40

 
$
.10

 
$
.27