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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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 $48.1 million, $51.8 million, and $54.4 million for the years ended December 31, 2016, 2015 and 2014, 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, 2013 to December 31, 2016 is presented below.
 
 
Number of
non-vested
shares
 
Weighted
average
grant-date
fair value
Non-vested restricted shares at December 31, 2013
 
2,714,312

 
$
37.50

Granted
 
1,424,764

 
61.11

Vested
 
(1,007,166
)
 
35.91

Forfeited
 
(453,146
)
 
44.90

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