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Stock Based Compensation Stock Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of restricted stock award activity
The following table contains information on restricted stock award activity for the six months ended June 30, 2019:
 
Number of Award
Shares
Outstanding at December 31, 2018
299,642

Granted
317,290

Released
(280,386
)
Canceled
—

Outstanding at June 30, 2019
336,546
Schedule of performance-based restricted stock award activity
The following table contains information on performance-based restricted stock award activity for the six months ended June 30, 2019:
 
Number of  Performance-Based Award Shares
Outstanding at December 31, 2018
1,342,000

Granted
512,000

Released
(447,334
)
Canceled 
(23,332
)
Outstanding at June 30, 2019
1,383,334