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Equity Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Information Related to PSUs
The following table summarizes information related to the total number of PSUs awarded as of September 30, 2018:
 
Number of
PSUs
 
Weighted
Average Fair
Value
 
Total Fair
Value ($ in thousands)
PSUs outstanding at December 31, 2017
16,350,000

 
$
1.41

 
$
23,054

PSUs granted
6,825,000

 
$
1.88

 
$
12,810

PSUs vested
—

 
$
—

 
$
—

Conversion (1)
(22,016,250
)
 
$
—

 
$
—

PSUs outstanding at September 30, 2018
1,158,750

 
$
30.95

 
$
35,864
Schedule of Assumptions Used to Determine Grand Date Fair Value and Associated Compensation Expense for PSU Awards Granted
The following assumptions were used for the Monte Carlo simulation model to determine the grant date fair value and associated compensation expense for the PSUs granted during the following periods:
 
Six Months Ended June 30, 2018
Three Months Ended September 30, 2018
Company enterprise value (in billions)
$
4.56

$
4.19

Equity volatility
34.0
%
36.0
%
Weighted average risk-free interest rate
1.96
%
2.54
%