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Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Non-qualified stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of activity
The following table summarizes activity related to stock options for the three months ended March 31, 2018 and 2017:
 
Options Outstanding
 
Options Exercisable
 
Number of Options
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Life
 
Number of Options
 
Weighted Average Exercise Price
Per Share
December 31, 2016
8,234,000

 
$
19.00

 
8.29

 
2,058,500

 
$
19.00

Granted

 

 

 

 

Exercised

 

 

 

 

Forfeited or expired
(195,000
)
 

 

 

 

March 31, 2017
8,039,000

 
$
19.00

 
8.05

 
2,009,750

 
$
19.00

 
 
 
 
 
 
 
 
 
 
December 31, 2017
7,783,000

 
$
19.00

 
7.29

 
3,891,500

 
$
19.00

Granted

 

 

 

 

Exercised
(732,000
)
 
19.00

 

 
(732,000
)
 
19.00

Forfeited or expired

 

 

 

 

March 31, 2018
7,051,000

 
$
19.00

 
7.05

 
3,182,000

 
$
19.00

Restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of activity related to restricted stock units
The following table summarizes activity related to the RSUs:
 
Number of Shares
 
Weighted
Average Fair Value 
At December 31, 2016
1,573,441

 
$
18.28

Granted

 

Forfeited
(95,481
)
 
18.38

Vested

 

At March 31, 2017
1,477,960

 
$
18.28

 
 
 
 
At December 31, 2017
853,047

 
$
17.94

Granted
1,044,690

 
20.64

Forfeited
(30,626
)
 
18.52

Vested

 

At March 31, 2018
1,867,111

 
$
18.85