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Stock Based Compensation
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Stock Based Compensation Stock Based Compensation
The following table highlights stock based compensation for the three and nine months ended September 30, 2020 and 2019:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2020201920202019
Restricted stock units (a)$4,612 $3,014 $10,748 $9,177 
Stock options (b)— — 362 — 
Stock based compensation$4,612 $3,014 $11,110 $9,177 

(a) Includes service-based and performance-based restricted stock units.
(b) Represents expense related to a modification of vested stock options.

During the three and nine months ended September 30, 2020, the Company granted less than 0.1 million and 0.4 million service-based restricted stock unit awards, respectively. In addition, during the nine months ended September 30, 2020, the Company granted performance-based restricted stock units that allow for a maximum of 0.2 million performance-based restricted stock units to be earned.

During the nine months ended September 30, 2019, the Company granted 0.5 million service-based restricted stock unit awards and performance-based restricted stock units that allow for a maximum of 0.4 million performance-based restricted stock units to be earned.