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UNIT INCENTIVE PLAN (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Restricted Unit Activity
Restricted unit activity for the three years ended December 31, 2019 was as follows:
 
Units
 
Weighted Avg
Grant Date
Fair Value ($)
Outstanding December 31, 2016
35,493

 
59.96

Grants
20,893

 
66.10

Vested
(14,190
)
 
66.48

Forfeited
(1,550
)
 
65.02

Tendered back to pay tax withholding
(1,432
)
 
65.65

Outstanding December 31, 2017
39,214

 
64.62

Grants
16,605

 
69.98

Vested
(15,151
)
 
65.03

Tendered back to pay tax withholding
(1,466
)
 
64.59

Outstanding December 31, 2018
39,202

 
66.72

Grants
16,678

 
69.84

Vested
(17,090
)
 
66.33

Forfeited
(272
)
 
69.50

Tendered back to pay tax withholding
(1,143
)
 
69.75

Outstanding December 31, 2019
37,375

 
68.29