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SHARE BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Activity for Shares
The following table summarizes activity relating to carry units:
 
Number of Time
Vesting Awards
 
Number of Performance
Based Vesting Awards
 
Weighted Average Grant Date Fair Value
Balance, December 31, 2017
168,550,001

 
10,000,000

 
$
0.71

Vested
(43,462,500
)
 
—

 
0.37

Forfeited
(7,375,001
)
 
—

 
0.60

Balance, June 30, 2018
117,712,500

 
10,000,000

 
0.94
Stock Option Activity
The following table summarizes activity related to employee stock options for the six months ended June 30, 2018:
 
Shares Under Option
 
Weighted Average
Exercise
Price Per Share
 
Weighted Average Remaining
Contractual Term
(in years)
 
 
 
Time
Vesting
 
Performance
Based Vesting
 
 
 
Aggregate Intrinsic
Value (a)
Balance at December 31, 2017
5,110,747

 
—

 
$
19.48

 
9.97

 
$
8,944

Granted
1,943,676

 
95,953

 
18.34

 
 
 
 
Forfeited
(179,705
)
 
(22,314
)
 
20.94

 
 
 
 
Balance at June 30, 2018
6,874,718

 
73,639

 
19.10

 
9.30

 
(14,202
)
Options exercisable at June 30, 2018
—

 
—

 
—

 
—

 
—

 
(a)
The aggregate intrinsic value is calculated as the difference between the exercise price and the closing price of the Company's Class A common stock at the respective date.
Aggregate Assumptions Used to Calculated the Fair Values of Stock Options
The following aggregate assumptions were used to calculate the fair values of stock option awards granted during the six months ended June 30, 2018:
Risk-free interest rate
 
2.75%
Expected life (in years)
 
6.49
Dividend yield
 
—%
Volatility
 
35.16%
Grant date fair value
 
$7.08