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Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Stock Option Activity

Stock option activity under the Plan during the year ended December 31, 2018 is summarized below.

 

 

 

Shares

 

 

Weighted Average

Exercise Price

 

 

Weighted Average

Remaining

Contractual Term

 

Aggregate

Intrinsic Value

 

Outstanding at December 31, 2017

 

 

3,058,459

 

 

$

11.30

 

 

 

 

 

 

 

Exercised

 

 

184,808

 

 

 

9.08

 

 

 

 

 

 

 

Forfeited

 

 

216,796

 

 

 

13.50

 

 

 

 

 

 

 

Granted

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2018

 

 

2,656,855

 

 

$

11.27

 

 

6.01

 

$

11,861,636

 

Exercisable at December 31, 2018

 

 

817,025

 

 

$

10.77

 

 

5.84

 

$

4,037,146

 

 

Summary of Non-vested Stock Option Activity

The following is a summary of non-vested stock option activity for the Company for the years ended December 31, 2018, 2017, and 2016.

 

 

 

Shares

 

 

Weighted

Average Grant

Date Fair

Value

 

Non-vested at December 31, 2015

 

 

3,393,441

 

 

$

4.56

 

Granted

 

 

169,987

 

 

 

6.58

 

Vested

 

 

(372,515

)

 

 

4.41

 

Forfeited

 

 

(174,813

)

 

 

3.06

 

Non-vested at December 31, 2016

 

 

3,016,100

 

 

 

4.78

 

Granted

 

 

 

 

 

 

Vested

 

 

(340,362

)

 

 

4.36

 

Forfeited

 

 

(310,739

)

 

 

6.25

 

Non-vested at December 31, 2017

 

 

2,364,999

 

 

 

4.65

 

Granted

 

 

 

 

 

 

Vested

 

 

(308,373

)

 

 

7.51

 

Forfeited

 

 

(216,796

)

 

 

5.90

 

Non-vested at December 31, 2018

 

 

1,839,830

 

 

$

4.60

 

 

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

Weighted average assumptions used for options granted during the year ended December 31, 2016 were as follows:

 

 

 

2016

 

Risk free rate

 

 

1.56

%

Dividend yield

 

 

0.05

%

Volatility

 

 

44.20

%

Average life (in years)

 

 

7

 

 

Schedule of Nonvested Restricted Stock Activity

The following is a summary of non-vested RSU stock activity for the Company for the year ended December 31, 2018.

 

 

 

Shares

 

 

Weighted

Average Grant

Date Fair

Value

 

Non-vested at December 31, 2017

 

 

181,814

 

 

$

20.03

 

Granted

 

 

355,150

 

 

 

25.17

 

Vested

 

 

91,589

 

 

 

23.62

 

Forfeited

 

 

57,188

 

 

 

20.27

 

Non-vested at December 31, 2018

 

 

388,187

 

 

$

23.85

 

 

Schedule of Nonvested Restricted Stock Units Activity

The following is a summary of non-vested Market RSU stock activity for the Company for the year ended December 31, 2018.

 

 

 

Shares

 

 

Weighted

Average Grant

Date Fair

Value

 

Non-vested at December 31, 2017

 

 

2,532,808

 

 

$

8.78

 

Granted

 

 

485,000

 

 

 

16.23

 

Vested

 

 

 

 

 

 

Forfeited

 

 

308,606

 

 

 

10.89

 

Non-vested at December 31, 2018

 

 

2,709,202

 

 

$

9.87