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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Entity Information [Line Items]          
Goodwill $ 527,592   $ 527,592   $ 680,996
Impairment of equity investments 0 $ 0 37,730 $ 0  
Natural Gas Gathering And Processing [Member]          
Entity Information [Line Items]          
Impairment of long-lived assets     380,500    
Impairment of intangible assets     19,900    
Goodwill $ 0   0   153,404
Goodwill impairment charge     $ 153,400    
Natural Gas Gathering And Processing [Member] | Venice Energy Services Company [Member]          
Entity Information [Line Items]          
Equity Method Investment, Ownership Percentage 10.20%   10.20%    
Impairment of equity investments - goodwill     $ 22,300    
Impairment of equity investments     30,500    
Natural Gas Liquids          
Entity Information [Line Items]          
Impairment of long-lived assets     70,200    
Goodwill $ 371,217   $ 371,217   371,217
Natural Gas Liquids | Chisholm Pipeline Company [Member]          
Entity Information [Line Items]          
Equity Method Investment, Ownership Percentage 50.00%   50.00%    
Impairment of equity investments     $ 7,200    
Natural Gas Pipelines          
Entity Information [Line Items]          
Goodwill $ 156,375   $ 156,375   $ 156,375