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Share-based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of stock options activity
The following table summarizes activity related to stock options for the years ended December 31, 2020, 2019 and 2018:

 Options OutstandingOptions Exercisable
 Number of OptionsWeighted Average Exercise Price Per ShareWeighted Average Remaining Contractual LifeNumber of OptionsWeighted Average Exercise Price
Per Share
At December 31, 20177,738,000 $19.00 7.293,869,000 $19.00 
Granted— — — — — 
Exercised(4,168,100)19.00 — — 19.00 
Forfeited or expired(83,750)— — — — 
At December 31, 20183,486,150 $19.00 6.301,660,400 $19.00 
Granted156,129 13.60 4.37156,129 13.60 
Exercised(353,500)19.00 — (353,500)19.00 
Forfeited or expired(55,000)— — — — 
At December 31, 20193,233,779 $18.74 5.243,248,779 $18.74 
Granted— — — — — 
Exercised(909,627)18.07 — (909,627)18.07 
Forfeited or expired— — — — — 
At December 31, 20202,324,152 $19.00 4.242,324,152 $19.00 
Schedule of activity related to restricted stock units
The following table summarizes activity related to the RSUs (including the Assumed Awards) and RSAs:
Number of RSUs and RSAsWeighted
Average Fair Value 
At December 31, 2017853,047 $17.94 
Granted1,265,899 20.89 
Forfeited(127,493)18.30 
Vested(612,531)18.76 
At December 31, 20181,378,922 $20.03 
Granted4,063,541 25.07 
Forfeited(643,709)21.58 
Vested(1,805,265)24.08 
At December 31, 20192,993,489 $24.10 
Granted (1)3,318,169 17.49 
Forfeited(430,961)17.45 
Vested(2,487,613)20.17 
At December 31, 20203,393,084 $21.35 
(1) Excluded in the number of RSUs and RSAs are 400,000 participating RSAs where the grant date has not been achieved because the performance conditions have not been met.