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ACQUISITIONS Table 2 - Navigator Pro Forma Information (Details) - Navigator Acquisition [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenues $ 1,828,418
Net income $ 127,433
Basic net income per common unit | $ / shares $ 0.31
Diluted net income per common unit | $ / shares $ 0.31
Transaction costs $ 14,100