EQUITY COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of equity-based compensation expense, net of assumed forfeitures

Equity-based compensation expense, net of forfeitures is included in the following table:

	For the Three Months Ended   March 31,
	2018		2017
Restricted units	$	18,030	$	11,219
Options	2,664		3,482
Phantom units	393		388
Equity-based compensation expense	$	21,087	$	15,089

Summary of unvested restricted units' activity

The following table presents unvested restricted units' activity during the three months ended March 31, 2018:

	Restricted Units		Weighted Average Grant Date Fair Value Per Unit
Balance - January 1, 2018	13,751,888		$	17.58
Granted	3,635,419		23.61
Vested	(835,124	)	15.33
Forfeited	(199,637	)	19.83
Balance - March 31, 2018	16,352,546		$	18.98

Summary of unvested options activity

A summary of options activity during the three months ended March 31, 2018 is presented below:

	Options		Weighted Average Exercise Price		Weighted Average Remaining Life (in years)	Aggregate Intrinsic Value
Balance - January 1, 2018	20,495,025		$	18.99	6.09	$	20,611
Granted	—		—		—
Exercised	—		—		—
Expired	(219,034	)	19.00		—
Forfeited	(444,203	)	19.00		—
Balance - March 31, 2018	19,831,788		$	18.99	5.84	$	47,762
Exercisable at March 31, 2018	7,235,214		$	18.99	5.38	$	17,420

Summary of unvested phantom units activity

A summary of unvested phantom unit activity during the three months ended March 31, 2018 is presented below:

	Phantom Units		Weighted Average Grant Date Fair Value Per Share
Balance - January 1, 2018	156,153		$	19.00
Vested	—
Forfeited	(9,362	)	19.00
Balance - March 31, 2018	146,791		$	19.00