v3.8.0.1
UNIT-BASED COMPENSATION Narrative 1 (Details) - The Amended 2000 LTIP [Member] - shares
Dec. 31, 2017
Mar. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unit-based compensation, number of units authorized   3,250,000
Unit-based compensation, number of units available to be awarded 679,045