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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
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 three months ended March 31, 2020:
 
Number of Shares
   
Weighted Average
Grant Date
Fair Value
 
Unvested at beginning of year
   
6,516,101
    $
13.31
 
Granted
   
2,387,645
     
11.64
 
Vested
   
(1,964,371
 )    
14.14
 
Canceled
   
(52,840
 )    
12.30
 
                 
Unvested at end of period
   
6,886,535
     
12.51