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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Activity for Restricted Stock Awards
The following table provides a summary of activity with regard to restricted stock awards in the six months ended June 30, 2019:
                 
 
Number of Shares
   
Weighted Average
Grant Date
Fair Value
 
Unvested at beginning of year
   
6,904,388
    $
14.74
 
Granted
   
1,940,798
     
10.42
 
Vested
   
(2,109,295
)    
15.24
 
Canceled
   
(124,250
)    
13.12
 
                 
Unvested at end of period
   
6,611,641
     
13.34