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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock options activity
The following table summarizes activity related to stock options for the year ended December 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
At December 31, 2016
8,234,000

 
$
19.00

 
8.29

 
2,058,500

 
$
19.00

Granted
—

 
—

 
—

 
—

 
—

Exercised
—

 
—

 
—

 
—

 
—

Forfeited or expired
(496,000
)
 
—

 
—

 
—

 
—

At December 31, 2017
7,738,000

 
$
19.00

 
7.29

 
3,869,000

 
$
19.00

Granted
—

 
—

 
—

 
—

 
—

Exercised
(4,168,100
)
 
19.00

 
—

 
—

 
—

Forfeited or expired
(83,750
)
 
—

 
—

 
—

 
—

At December 31, 2018
3,486,150

 
$
19.00

 
6.30

 
1,660,400

 
$
19.00
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
64,402

 
18.09

Forfeited
(258,250
)
 
18.4

Vested
(526,546
)
 
18.75

At December 31, 2017
853,047

 
17.94

Granted
1,265,899

 
20.89

Forfeited
(127,493
)
 
18.30

Vested
(612,531
)
 
18.76

At December 31, 2018
1,378,922

 
$
20.03