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UNIT INCENTIVE PLAN (Restricted Unit Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Shares      
Tendered back to pay tax withholding (in units) (1,000) (1,000) (1,000)
Restricted Stock and Restricted Stock Units      
Number of Shares      
Outstanding Beginning Balance (in shares) 39,202 39,214 35,493
Grants (in shares) 16,678 16,605 20,893
Vested (in shares) (17,090) (15,151) (14,190)
Forfeited (in shares) (272)   (1,550)
Tendered back to pay tax withholding (in units) (1,143) (1,466) (1,432)
Outstanding Ending Balance (in shares) 37,375 39,202 39,214
Weighted Average Grant Date Fair Value      
Outstanding Beginning Balance (in USD per share) $ 66.72 $ 64.62 $ 59.96
Grants (in USD per share) 69.84 69.98 66.10
Vested (in USD per share) 66.33 65.03 66.48
Forfeited (in USD per share) 69.50   65.02
Tendered back to pay tax withholding (in USD per share) 69.75 64.59 65.65
Outstanding Ending Balance (in USD per share) $ 68.29 $ 66.72 $ 64.62