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Equity-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Changes in Unvested Shares/Units of Restricted Stock

A summary of changes in unvested shares/units for the nine months ended September 30, 2018 is as follows:

 

 

 

Number of shares/units

 

Outstanding at December 31, 2017

 

 

1,036,635

 

Granted

 

 

522,672

 

Vested

 

 

(379,312

)

Forfeited

 

 

(180,956

)

Outstanding at September 30, 2018

 

 

999,039