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EQUITY COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
Restricted units
$
14,555

 
$
5,350

 
$
40,375

 
$
14,797

Options
3,224

 
2,693

 
10,637

 
11,153

Phantom units
312

 
433

 
1,085

 
1,235

Equity-based compensation expense
$
18,091

 
$
8,476

 
$
52,097

 
$
27,185

Summary of unvested restricted units' activity
The following table presents unvested restricted units’ activity during the nine months ended September 30, 2017:
 
Restricted Units
 
Weighted Average
Grant Date Fair
Value Per Unit
Balance - January 1, 2017
8,058,372

 
$
16.38

Granted
7,944,144

 
18.61

Vested
(1,833,422
)
 
16.56

Forfeited
(426,238
)
 
17.82

Balance - September 30, 2017
13,742,856

 
$
17.58

Summary of unvested options activity
A summary of options activity during the nine months ended September 30, 2017 is presented below:
 
Options
 
Weighted Average Exercise Price
 
Weighted Average
Remaining Life
(in years)
 
Aggregate Intrinsic Value
Balance - January 1, 2017
22,232,134

 
$
18.99

 
7.35
 
 
Granted

 

 
 
 
Exercised
(54,500
)
 
19.00

 
 
 
Expired
(433,609
)
 
19.00

 
 
 
Forfeited
(721,101
)
 
19.00

 
 
 
Balance - September 30, 2017
21,022,924

 
$
18.99

 
6.56
 
$

Exercisable at September 30, 2017
7,106,989

 
$
19.00

 
6.56
 
$

Summary of unvested phantom units activity
A summary of unvested phantom unit activity during the nine months ended September 30, 2017 is presented below:
 
 
Phantom Units
 
Weighted Average
Grant Date Fair
Value Per Unit
Balance - January 1, 2017
 
266,138

 
$
19.00

Vested
 
(87,222
)
 
19.00

Forfeited
 
(20,872
)
 
19.00

Balance - September 30, 2017
 
158,044

 
$
19.00