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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Stock-Based Compensation Expense The Company’s associated compensation expense, which is included in the caption “General and administrative expenses” in the consolidated statements of comprehensive income, was $52.0 million, $47.2 million, and $45.9 million for the years ended December 31, 2019, 2018 and 2017, respectively.
Restricted stock [Member]  
Summary of Changes in Non-vested Shares of Restricted Stock
A summary of changes in non-vested restricted shares from December 31, 2016 to December 31, 2019 is presented below.
 
 
Number of
non-vested
shares
 
Weighted
average
grant-date
fair value
Non-vested restricted shares at December 31, 2016
 
3,913,634

 
$
37.12

Granted
 
1,585,870

 
44.58

Vested
 
(874,665
)
 
57.36

Forfeited
 
(598,729
)
 
37.34

Non-vested restricted shares at December 31, 2017
 
4,026,110

 
$
35.63

Granted
 
1,390,914

 
52.71

Vested
 
(1,116,329
)
 
46.19

Forfeited
 
(278,286
)
 
38.06

Non-vested restricted shares at December 31, 2018
 
4,022,409

 
$
38.44

Granted
 
1,526,825

 
43.21

Vested
 
(1,737,304
)
 
24.19

Forfeited
 
(350,022
)
 
47.13

Non-vested restricted shares at December 31, 2019
 
3,461,908

 
$
46.82