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UNIT-BASED COMPENSATION PLANS (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Awards activity under the LTIP
The following table sets forth the LTIP activity for the periods indicated (in thousands, except per unit amounts):
 
Number of
LP Units
 
Weighted
Average
Grant Date
Fair Value
per LP Unit (1)
Unvested at January 1, 2019
1,645

 
$
55.52

Granted (2)
908

 
30.98

Vested
(244
)
 
52.24

Forfeited
(265
)
 
50.24

Unvested at September 30, 2019
2,044

 
$
45.70


                                                      
(1)
Determined by dividing the aggregate grant date fair value of awards by the number of awards issued. The weighted-average grant date fair value per LP Unit for forfeited and vested awards is determined before an allowance for forfeitures.
(2)
Includes both phantom and performance awards. Performance awards are granted at a target amount but, depending on our performance during the vesting period with respect to certain pre-established goals, the number of LP Units issued upon vesting of such performance awards can be greater or less than the target amount.