EQUITY COMPENSATION (Tables)

9 Months Ended

Sep. 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   September 30,				For the Nine Months Ended   September 30,
	2018		2017		2018		2017
Restricted units	$	19,251	$	14,555	$	55,798	$	40,375
Restricted units with a market condition	614		—		614		—
Options	3,660		3,224		9,953		10,637
Phantom units	415		312		1,169		1,085
Equity-based compensation expense	$	23,940	$	18,091	$	67,534	$	52,097

Summary of unvested restricted units' activity

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

	Restricted Units		Weighted Average Grant Date Fair Value Per Unit
Balance - January 1, 2018	13,751,888		$	17.58
Granted	4,457,869		23.12
Vested	(1,917,705	)	16.95
Forfeited	(291,439	)	19.42
Balance - September 30, 2018	16,000,613		$	19.16

The following table presents the unvested market condition awards' activity during the nine months ended September 30, 2018:

	Market Condition Awards Units	Weighted Average Grant Date Fair Value Per Unit
Balance - January 1, 2018	—	$	—
Granted	1,333,334	9.30
Vested	—	—
Forfeited	—	—
Balance - September 30, 2018	1,333,334	$	9.30

Schedule of valuation assumptions

Below is a summary of the significant assumptions used to estimate the grant date fair value of the market condition awards:

Closing price of the Company's common shares as of valuation date	$	20.95
Risk-free interest rate	2.95		%
Volatility	30.0		%
Dividend yield	5.0		%
Cost of equity	10.0		%

Summary of unvested options activity

A summary of options activity during the nine months ended September 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	(907,046	)	19.00		—
Forfeited	(444,203	)	19.00		—
Balance - September 30, 2018	19,093,776		$	18.99	5.56	$	80,359
Exercisable at September 30, 2018	12,698,194		$	19.00	5.53	$	53,388

Summary of unvested phantom units activity

A summary of unvested phantom unit activity during the nine months ended September 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	(18,830	)	19.00
Balance - September 30, 2018	66,971		$	19.00