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Share-Based Compensation and Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Summary of Share-based Compensation Expense by Type of Award

The following table reflects share-based compensation expense by type of award:

 

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

 

2016

 

Share-based compensation expense:

 

 

 

 

 

 

 

 

 

 

 

 

Restricted stock units, including all performance and market

    based awards

 

$

6,062

 

 

$

5,433

 

 

$

4,457

 

Stock options

 

 

—

 

 

 

237

 

 

 

318

 

Total share-based compensation

 

 

6,062

 

 

 

5,670

 

 

 

4,775

 

Tax effect on share-based compensation

 

 

1,362

 

 

 

2,052

 

 

 

1,743

 

Net effect on net income

 

$

4,700

 

 

$

3,618

 

 

$

3,032

 

Effect on earnings per share:

 

 

 

 

 

 

 

 

 

 

 

 

Basic

 

$

(0.15

)

 

$

(0.11

)

 

$

(0.10

)

Diluted

 

$

(0.15

)

 

$

(0.11

)

 

$

(0.10

)
Summary of Nonvested Restricted Stock Unit Activity

A summary of the Company’s restricted stock unit activity with respect to the years ended December 31, 2016, 2017 and 2018 follows:

 

 

 

Number of

Shares

 

 

Weighted

Average

Grant Date

Fair Value

 

Nonvested at December 31, 2015

 

 

1,169

 

 

$

11.40

 

Granted

 

 

429

 

 

$

13.20

 

Vested

 

 

(413

)

 

$

10.80

 

Forfeited

 

 

(49

)

 

$

11.14

 

Nonvested at December 31, 2016

 

 

1,136

 

 

$

12.30

 

Granted

 

 

280

 

 

$

22.70

 

Vested

 

 

(321

)

 

$

11.90

 

Forfeited

 

 

(81

)

 

$

13.78

 

Nonvested at December 31, 2017

 

 

1,014

 

 

$

14.88

 

Granted

 

 

283

 

 

$

27.99

 

Vested

 

 

(404

)

 

$

14.26

 

Forfeited

 

 

(99

)

 

$

17.79

 

Nonvested at December 31, 2018

 

 

794

 

 

$

19.51

 
Summary of Company's Stock Option Activity

A summary of the Company’s stock option activity with respect to the years ended December 31, 2016, 2017 and 2018 follows:

 

 

 

Shares

 

 

Weighted

Average

Exercise

Price

Per Share

 

 

Weighted

Average

Remaining

Contractual

Term (years)

 

 

Aggregate

Intrinsic Value

 

Outstanding at December 31, 2015

 

 

490

 

 

$

9.46

 

 

 

 

 

 

 

 

 

Granted

 

 

—

 

 

 

—

 

 

 

 

 

 

 

 

 

Exercised

 

 

(231

)

 

 

7.76

 

 

 

 

 

 

 

 

 

Expired

 

 

(44

)

 

 

14.74

 

 

 

 

 

 

 

 

 

Forfeited

 

 

—

 

 

 

—

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2016

 

 

215

 

 

 

10.19

 

 

 

 

 

 

 

 

 

Granted

 

 

—

 

 

 

—

 

 

 

 

 

 

 

 

 

Exercised

 

 

(142

)

 

 

9.14

 

 

 

 

 

 

 

 

 

Expired

 

 

—

 

 

 

—

 

 

 

 

 

 

 

 

 

Forfeited

 

 

—

 

 

 

—

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2017

 

 

73

 

 

$

12.22

 

 

 

 

 

 

 

 

 

Granted

 

 

—

 

 

 

—

 

 

 

 

 

 

 

 

 

Exercised

 

 

(26

)

 

 

 

 

 

 

 

 

 

 

 

 

Expired

 

 

—

 

 

 

—

 

 

 

 

 

 

 

 

 

Forfeited

 

 

—

 

 

 

—

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2018

 

 

47

 

 

$

12.22

 

 

 

4.0

 

 

$

384

 

Vested or expected to vest at December 31, 2018

 

 

47

 

 

$

12.22

 

 

 

4.0

 

 

$

384

 

Exercisable at December 31, 2018

 

 

47

 

 

$

12.22

 

 

 

4.0

 

 

$

384

 
Market Performance Based Restricted Stock Units [Member]  
Summary of Nonvested Restricted Stock Unit Activity

The following table provides details of the MPRSUs granted during the twelve month periods ended December 31, 2018 and 2017:

 

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

Granted

 

53

 

 

38

 

Maximum vest potential shares

 

105

 

 

76

 

Estimated fair value per share

 

$

30.76

 

 

$

25.30