EQUITY COMPENSATION (Tables)

6 Months Ended

Jun. 30, 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   June 30,				For the Six Months Ended   June 30,
	2018		2017		2018		2017
Restricted units	$	18,516	$	14,601	$	36,547	$	25,818
Options	3,630		3,931		6,293		7,413
Phantom units	361		385		754		775
Equity-based compensation expense	$	22,507	$	18,917	$	43,594	$	34,006

Summary of unvested restricted units' activity

The following table presents unvested restricted units' activity during the six months ended June 30, 2018:

	Restricted Units		Weighted Average Grant Date Fair Value Per Unit
Balance - January 1, 2018	13,751,888		$	17.58
Granted	3,681,702		23.58
Vested	(1,903,923	)	16.93
Forfeited	(258,286	)	19.55
Balance - June 30, 2018	15,271,381		$	19.07

Summary of unvested options activity

A summary of options activity during the six months ended June 30, 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	(50,000	)	19.00		—	90
Expired	(889,432	)	19.00		—
Forfeited	(444,203	)	19.00		—
Balance - June 30, 2018	19,111,390		$	18.99	5.81	$	32,655
Exercisable at June 30, 2018	12,715,808		$	19.00	5.78	$	21,672

Summary of unvested phantom units activity

A summary of unvested phantom unit activity during the six months ended June 30, 2018 is presented below:

	Phantom Units		Weighted Average Grant Date Fair Value Per Share
Balance - January 1, 2018	156,153		$	19.00
Vested	(70,352	)	19.00
Forfeited	(16,200	)	19.00
Balance - June 30, 2018	69,601		$	19.00