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STOCKHOLDER'S EQUITY AND SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Fair Value of Stock Options and Performance Shares
The Company used the following assumptions for the BSM to determine the fair value of the stock options:
Year Ended December 31, 2019Year Ended December 31, 2018
Weighted-average grant date price of our common stock (per share)$13.83  $10.00  
Expected volatility28.6 %28.6 %
Weighted-average risk-free interest rate1.7 %2.9 %
Expected term (in years)6.256.25
Expected dividend yield0.0 %0.0 %
The following were the assumptions used in calculating the fair value of the units at the grant dates:
Units Issued
February 2017		Units Issued
September 2017
Expected dividend yield0.0 %0.0 %
Expected volatility46.9 %47.4 %
Risk-free interest rate2.1 %1.9 %
Expected term (in years)65.8
Stock Option Activity
A summary of the stock option activity during the year ended December 31, 2019 is presented below:
Number of
Options		Weighted-Average
Exercise Price		 Weighted-Average
Remaining Contractual
Term (Years)		Weighted-Average
Grant Date
Fair Value
Outstanding at December 31, 20182,881,219  $10.00  9.60$3.47  
Granted475,000  $13.83  $4.38  
Exercised(1)
(48,000) $10.20  $3.54  
Forfeited(403,000) $10.81  $3.68  
Expired—  $—  
Outstanding at December 31, 20192,905,219  $10.51  8.74$3.58  
Exercisable at December 31, 2019(2)
639,805  $9.95  8.59$3.45  

(1) The aggregate intrinsic value of stock options exercised during the year ended December 31, 2019 was $0.2 million.
(2) The aggregate fair value of all vested/exercisable options outstanding as of December 31, 2019 was $7.7 million.
Incentive Units Authorized and Issued
Incentive units authorized and issued during the Successor period from February 1, 2017 through December 31, 2017 consisted of the following:
Incentive UnitsAuthorizedUnits Issued
February 2017		Units Issued
September 2017
Class B10,000,000  9,055,000  665,000  
Class C5,000,000  4,527,500  332,500  
Class D5,000,000  4,527,500  332,500  
Grant Date Fair Value Per Unit for Each Class of Incentive Unit
The grant date fair value per unit for each class of incentive unit for the Successor period from February 1, 2017 to December 31, 2017 were as follows:
Incentive UnitsPer Unit Amount
February 2017
Issuance		Per Unit Amount
September 2017
Issuance
Class B$0.4872  $0.4948  
Class C$0.2077  $0.2126  
Class D$0.1485  $0.1535  
Number of Units and Weighted-average Grant Date Fair Value
The number of units and the weighted-average grant date fair value for the incentive units were as follows:

Number of
Class B Units		Weighted-
Average
Grant Date
Fair Value		Number of
Class C Units		Weighted-
Average
Grant Date
Fair Value		Number of
Class D Units		Weighted-
Average
Grant Date
Fair Value
Granted during the Successor Period
9,720,000  $0.4878  4,860,000  $0.2080  4,860,000  $0.1489  
Vested(1,944,000) 0.4878  —  —  —  —  
Forfeited(304,000) 0.4872  (190,000) 0.2077  (190,000) 0.1485  
Outstanding at December 31, 20177,472,000  0.4879  4,670,000  0.2080  4,670,000  0.1489  
Granted410,000  0.4948  205,000  0.2126  205,000  0.1535  
Vested(7,882,000) 0.4883  (4,875,000) 0.2082  (4,875,000) 0.1491  
Outstanding at December 31, 2018—  $—  —  $—  —  $—