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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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 (loss), was $45.9 million, $48.1 million, and $51.8 million for the years ended December 31, 2017, 2016 and 2015, 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, 2014 to December 31, 2017 is presented below.
 
 
Number of
non-vested
shares
 
Weighted
average
grant-date
fair value
Non-vested restricted shares at December 31, 2014
 
2,678,764

 
$
49.40

Granted
 
1,462,534

 
46.65

Vested
 
(555,517
)
 
48.07

Forfeited
 
(336,170
)
 
51.23

Non-vested restricted shares at December 31, 2015
 
3,249,611

 
$
48.20

Granted
 
2,064,508

 
22.36

Vested
 
(1,207,235
)
 
41.27

Forfeited
 
(193,250
)
 
39.79

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