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Stock Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of expenses related to share-based payments
The following table highlights the expense related to stock based compensation for the three months ended March 31, 2019 and 2018:
 
Three Months Ended March 31,
(in thousands)
2019
 
2018
Restricted stock units (a)
$
2,915

 
$
1,658

Restricted stock
—

 
91

Stock options
—

 
26

Stock based compensation
$
2,915

 
$
1,775


(a) Includes service-based and performance-based restricted stock units.