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Share Based Compensation (Tables)
 12 Months Ended
Jan. 31, 2018
Share-based Compensation [Abstract]  
The compensation cost and related income tax benefit for these plans The compensation cost and related income tax benefit for these plans were as follows:
 
 
For the years ended January 31,
 
 
2018
 
2017
 
2016
Share-based compensation cost
 
$
3,725

 
$
3,071

 
$
2,311

Tax benefit
 
1,275

 
1,103

 
819
Weighted average assumptions by grant year The weighted average assumptions used for the Black-Scholes option pricing model by grant year are as follows:
 
 
For the years ended January 31,
 
 
2018
 
2017
 
2016
Risk-free interest rate
 
1.68
%
 
1.05
%
 
1.33
%
Expected dividend yield
 
1.78
%
 
3.33
%
 
2.59
%
Expected volatility factor
 
33.87
%
 
32.61
%
 
36.81
%
Expected option term (in years)
 
4.25

 
4.00

 
3.75

 
 
 
 
 
 
 
Weighted average grant date fair value
 
$
7.35

 
$
3.05

 
$
4.77
Outstanding stock options Outstanding stock options as of January 31, 2018 and activity for the year then ended are presented below:
 
 
Number
of options
 
Weighted average exercise price
 
Aggregate intrinsic value
 
Weighted
average
remaining
contractual
term
(years)
Outstanding, January 31, 2017
 
990,900

 
$
24.58

 
 
 
 
Granted
 
85,800

 
29.20

 
 
 
 
Exercised
 
(206,000
)
 
31.01

 
 
 
 
Forfeited
 
(43,600
)
 
19.05

 
 
 
 
Expired
 
(124,150
)
 
31.70

 
 
 
 
Outstanding, January 31, 2018
 
702,950

 
$
22.34

 
$
11,396

 
2.49
 
 
 
 
 
 
 
 
 
Outstanding exercisable, January 31, 2018
 
331,717

 
$
23.43

 
$
5,014

 
1.95
 
 
 
 
 
 
 
 
 
Options vested, or expected to vest, January 31, 2018
 
702,950

 
$
22.34

 
$
11,396

 
2.49
Activity for RSUs under the plan Activity for performance-based RSUs under the Plan in fiscal 2018 was as follows:
 
 
Number
of restricted stock units expected to vest
 
Weighted
average grant date fair value per share
Outstanding, January 31, 2017
 
146,519

 
$
16.78

Granted
 
22,745

 
29.20

Vested
 
—

 
—

Forfeited
 
(16,164
)
 
16.89

Performance-based adjustment
 
26,629

 
23.96

Outstanding, January 31, 2018
 
179,729

 
$
19.40

 
 
 
 
 
Cumulative dividends, January 31, 2018
 
7,130

 
 
Activity for time-vested RSUs under the Plan in fiscal 2018 was as follows:
 
 
Number
of restricted stock units
 
Weighted
average grant date fair value per share
Outstanding, January 31, 2017
 
126,729

 
$
19.19

Granted
 
61,270

 
29.33

Vested
 
(23,122
)
 
29.62

Forfeited
 
(18,028
)
 
18.92

Outstanding, January 31, 2018
 
146,849

 
$
21.81

 
 
 
 
 
Cumulative dividends, January 31, 2018
 
5,129

 
 
Weighted average grant date fair values The weighted average grant date fair values of the time-based and performance-based RSUs by grant year are as follows:
 
 
For the years ended January 31,
 
 
2018
 
2017
 
2016
Weighted average grant date fair value: time-based RSUs
 
$
29.33

 
$
15.94

 
$
19.25

Weighted average grant date fair value: performance-based RSUs
 
$
29.20

 
$
15.61

 
$
20.09
Outstanding stock units Outstanding stock units as of January 31, 2018 and changes during the year then ended are presented below:
 
 
Number
of stock units
 
Weighted
average price
Outstanding, January 31, 2017
 
98,649

 
$
20.82

Granted
 
12,000

 
35.00

Deferred retainers
 
1,143

 
35.00

Dividends
 
1,547

 
33.98

Converted into common shares
 
(25,725
)
 
33.88

Outstanding, January 31, 2018
 
87,614

 
$
19.35