Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [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:

	Shares		Weighted Average Grant Date Fair Value per Share
Non-vested shares outstanding December 31, 2017	3,741,898		$	10.78
Granted	3,546,280		10.20
Vested	(1,826,855	)	9.71
Forfeited	(324,767	)	10.03
Non-vested shares outstanding December 31, 2018	5,136,556		$	10.81

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:

	Units		Weighted Average Grant Date Fair Value per Unit
Non-vested PSUs at December 31, 2017	1,872,710		$	11.10
Granted	854,400		12.71
Vested	(564,068	)	7.01
Forfeited	(130,830	)	41.71
Non-vested PSUs at December 31, 2018	2,032,212		$	10.94

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:

	2018		2017		2016
Forecast period (years)	2 - 4		2 - 4		4
Risk-free interest rate	2.08% - 2.31%		1.18% - 1.66%		1.25	%
Oasis stock price volatility	72.88	%	17.16	%	59.38	%

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 Units		Weighted Average Grant Date Fair Value per Unit
Non-vested units outstanding December 31, 2017	99,100		$	16.40
Granted	87,480		23.91
Vested	(29,254	)	16.40
Forfeited	(14,237	)	17.86
Non-vested units outstanding December 31, 2018	143,089		$	20.85

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 Units		Weighted Average Grant Date Fair Value per Unit
Non-vested units outstanding December 31, 2017	11,766		$	17.00
Granted	17,260		17.55
Vested	(11,766	)	17.00
Forfeited	—		—
Non-vested units outstanding December 31, 2018	17,260		$	17.55