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STOCK BASED COMPENSATION - (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock-Based Compensation Expense
The following table provides information regarding the amount and components of stock-based compensation expense, all of which is included in general and administrative expenses in the accompanying Condensed Consolidated Statements of Operations (in thousands):
 
 
Three Months Ended
September 30,
Nine Months Ended
September 30,
 
 
2019
 
2018
2019
 
2018
Restricted stock units (1)
 
$
2,747

 
$
2,673

$
8,105

 
$
6,778

Stock options
 
946

 
918

2,831

 
3,103

Total stock compensation
 
$
3,693

 
$
3,591

$
10,936

 
$
9,881


(1) Includes compensation expense related to time-based RSUs and performance-based RSUs. Outstanding performance-based RSUs reflected in the table above are reported at target level of performance.
Summary of Activity of Stock Units The following table summarizes the time-based RSU and performance-based RSU activity for the nine months ended September 30, 2019:
 
 
Shares
 
Weighted Average
Grant Date Fair
Value
Balance at December 31, 2018
 
1,925,364

 
$
16.49

Granted
 
713,247

 
18.45

Vested
 
(813,430
)
 
13.20

Forfeited (1)
 
(87,032
)
 
18.25

Balance at September 30, 2019
 
1,738,149

 
$
18.86


(1) Forfeitures on time-based RSUs are a result of terminations of employment, while forfeitures on performance-based RSUs are a result of failing to attain certain goals as outlined in our stock based compensation awards or termination of employment. Outstanding performance-based RSUs reflected in the table above are reported at target level of performance.
Summary of Stock Option Activity The following table summarizes the stock option activity for the nine months ended September 30, 2019:
 
 
Shares
 
Weighted
Average Exercise
Price Per Share
Outstanding at December 31, 2018
 
3,239,995

 
$
18.87

Granted
 
985,885

 
18.08

Exercised
 
(754,880
)
 
17.23

Canceled/Forfeited
 
(116,220
)
 
19.78

Outstanding at September 30, 2019
 
3,354,780

 
$
18.98

Options exercisable at September 30, 2019
 
1,410,017

 
$
19.11