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Equity-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summarized Information Related to Restricted Stock and Restricted Units
The following table summarizes information related to restricted stock held by the Company’s employees and directors for the periods presented:
SharesWeighted Average
Grant Date
Fair Value per Share
Non-vested shares outstanding December 31, 20185,136,556  $10.81  
Granted4,059,225  6.61  
Vested(2,656,483) 9.52  
Forfeited(803,131) 8.42  
Non-vested shares outstanding December 31, 20195,736,167  $8.77  
Summarized Information Related to Performance Share Units
The following table summarizes information related to PSUs held by the Company’s officers for the periods presented:
UnitsWeighted Average
Grant Date
Fair Value per Unit
Non-vested PSUs at December 31, 20182,032,212  $10.94  
Granted1,685,090  6.80  
Vested(423,953) 7.45  
Forfeited(266,125) 10.97  
Non-vested PSUs at December 31, 20193,027,224  $9.12  
Summary of Assumptions
The following assumptions were used for the Monte Carlo model to determine the grant date fair value and associated equity-based compensation expense of the PSUs granted during the periods presented:
 201920182017
Forecast period (years)
2 - 4
2 - 4
2 - 4
Risk-free interest rates
2.55% - 2.56%
2.08% - 2.31%
1.18% - 1.66%
Oasis stock price volatility71.17 %72.88 %17.16 %
Oasis initial value$5.85  $8.82  $15.64  
Oasis stock price on date of grant$6.63  $9.27  $15.21  
Summarized Information Related to Phantom Units
The following table summarizes information related to OMP Phantom Unit Awards held by certain employees of Oasis for the periods presented:
Phantom UnitsWeighted Average Grant Date Fair Value per Unit
Non-vested units outstanding December 31, 2018143,089  $20.85  
Granted341,290  18.57  
Vested(46,334) 20.33  
Forfeited(76,043) 19.30  
Non-vested units outstanding December 31, 2019362,002  $19.09  
Summarized Information Related to Restricted Units
The following table summarizes information related to restricted units held by certain directors of OMP for the periods presented:
Restricted UnitsWeighted Average Grant Date Fair Value per Unit
Non-vested units outstanding December 31, 201817,260  $17.55  
Granted16,170  18.57  
Vested(17,260) 17.55  
Forfeited—  —  
Non-vested units outstanding December 31, 201916,170  $18.57