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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
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 nine months ended September 30, 2018 is presented below. 
 
 
Number of
non-vested
shares
 
Weighted average
grant-date
fair value
Non-vested restricted shares outstanding at December 31, 2017
 
4,026,110

 
$
35.63

Granted
 
1,332,705

 
52.82

Vested
 
(1,077,356
)
 
46.67

Forfeited
 
(258,532
)
 
37.66

Non-vested restricted shares outstanding at September 30, 2018
 
4,022,927

 
$
38.24