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Equity-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Options Activity

The following table summarizes the status of, and changes in, our stock option awards during the six months ended June 30, 2018:
 
Number of
Shares
 
Weighted
Average
Exercise Price
 
Aggregate Intrinsic Value (in thousands)
 
Weighted
Average
Remaining Contractual Term in Years
Outstanding at December 31, 2017
908,919

 
$
28.46

 
$
7,008

 
6.1 years
Granted
—

 
—

 
—

 

Exercised
(4,167
)
 
14.65

 
—

 

Forfeited
(918
)
 
31.30

 
—

 

Expired
(1,838
)
 
$
31.30

 
$
—

 

Outstanding at June 30, 2018
901,996

 
$
28.52

 
$
3,692

 
5.3 years
Exercisable at June 30, 2018
855,446

 
$
27.38

 
$
3,692

 
5.2 years
Schedule of Restricted Stock, Restricted Stock Unit and Performance Share Unit Awards Activity
The following table summarizes the status of, and changes in, our performance share unit awards during the six months ended June 30, 2018:
 
Number of Shares
 
Grant Date Weighted
Average Fair Value
Unvested, December 31, 2017
881,416

 
$
42.16

Granted
201,417

 
31.24

Vested
(225,000
)
 
41.99

Forfeited
(8,072
)
 
52.92

Unvested, June 30, 2018
849,761

 
$
39.31

Restricted Stock and Restricted Stock Unit Awards
The following table summarizes the status of, and changes in, our unvested restricted stock awards during the six months ended June 30, 2018:
 
Number of Shares
 
Grant Date Weighted
Average Fair Value
Unvested, December 31, 2017
461,346

 
$
30.76

Granted
237,931

 
26.34

Vested
(216,228
)
 
30.04

Forfeited
(22,827
)
 
31.76

Unvested, June 30, 2018
460,222

 
$
28.77