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SHARE-BASED COMPENSATION Tables (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
The following table summarizes the Company's stock option activity for the years ended December 31, 2019, 2018 and 2017:
 
Stock Options
 
Weighted Average Exercise Price
 
Weighted Average Grant Date Fair Value
 
Weighted Average Remaining Contractual Term (years)
 
Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2017
1,879,308

 
$
2.73

 
 
 
4.6
 
$
2.1

Granted
99,396

 
$
8.86

 
$
4.11

 
 
 
 
Exercised
—

 
$
—

 
 
 
 
 
 
Forfeited
(1,224
)
 
$
3.39

 
 
 
 
 
 
Outstanding at December 31, 2017
1,977,480

 
$
3.04

 
 
 
5.2
 
$
21.8

Granted
—

 
$
—

 
$
—

 

 

Exercised
(500,924
)
 
$
1.46

 
 
 

 
$
4.0

Forfeited
(31,224
)
 
$
4.03

 
$
1.84

 

 

Outstanding at December 31, 2018
1,445,332

 
$
3.56

 
 
 
3.7
 
$
8.6

Granted
—

 
$
—

 
 
 
 
 
 
Exercised
(40,014
)
 
$
3.71

 
 
 
 
 
$
0.3

Forfeited
(696
)
 
$
8.86

 
$
4.07

 
 
 
 
Outstanding at December 31, 2019
1,404,622

 
$
3.56

 
 
 
2.6
 
$
12.1

 
 
 
 
 
 
 
 
 
 
Options exercisable at December 31, 2019
1,226,422

 
$
3.42

 
 
 
2.1
 
$
10.7
Schedule of Restricted Stock Activity
A summary of the activity of time-based and market-based unvested RSUs for the years ended December 31, 2019 and 2018 is presented in the following table:

 
Number of RSUs
 
Weighted Average
Grant Date Fair Value per Share
 
Time-Based
Market-Based
 
January 1, 2017
—

—

 
$
—

Granted
1,516,241

—

 
$
14.00

Vested
—

—

 
$
—

Forfeited
—

—

 
$
—

December 31, 2017
1,516,241

—

 
$
14.00

Granted
73,663

—

 
$
18.20

Vested
(508,126
)
—

 
$
14.00

Forfeited
(21,428
)
—

 
$
14.00

December 31, 2018
1,060,350

—

 
$
14.29

Granted
598,114

397,752

 
$
10.08

Vested
(514,552
)
—

 
$
14.21

Forfeited
(82,159
)
(2,891
)
 
$
13.71

December 31, 2019
1,061,753

394,861

 
$
11.47
Share-based Compensation Expense
Share-based compensation expense, which includes compensation costs from stock options and RSUs, included in the Consolidated Statements of Operations as a component of "Corporate, district and other" expenses is summarized in the following table (in thousands):
 
For the year ended,
 
2019
 
2018
 
2017
Pre-tax share-based compensation expense
$
10,323

 
$
8,210

 
$
965

Income tax benefit
(2,632
)
 
(2,217
)
 
(386
)
Total share-based compensation expense, net of tax
$
7,691

 
$
5,993

 
$
579