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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Restricted stock [Member]  
Summary of Changes in Non-vested Shares of Restricted Stock Outstanding
A summary of changes in non-vested restricted shares outstanding for the three months ended March 31, 2020 is presented below. 
 
 
Number of
non-vested
shares
 
Weighted average
grant-date
fair value
Non-vested restricted shares outstanding at December 31, 2019
 
3,461,908

 
$
46.82

Granted
 
2,454,235

 
28.41

Vested
 
(925,568
)
 
46.19

Forfeited
 
(42,818
)
 
39.88

Non-vested restricted shares outstanding at March 31, 2020
 
4,947,757

 
$
37.87