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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Entity [Line Items]      
Contract Liabilities, Contract Term 5 to 10 years.    
Number Of Years Of Service Employees Must Work To Be Entitled To Postretirement Medical And Life Insurance Benefits 5 years    
Impairment of equity investments $ 0 $ 37,730 $ 0
Natural Gas Gathering And Processing      
Entity [Line Items]      
Impairment charges   362,300  
Goodwill, Impairment Loss   153,400  
Natural Gas Liquids      
Entity [Line Items]      
Impairment charges   $ 71,600  
Venice Energy Services Company [Member] | Natural Gas Gathering And Processing      
Entity [Line Items]      
Net ownership percentage   10.20%  
Impairment of equity investments   $ 30,500  
Impairment of equity investments - goodwill   $ 22,300  
Chisholm Pipeline Company [Member] | Natural Gas Liquids      
Entity [Line Items]      
Net ownership percentage   50.00%  
Impairment of equity investments   $ 7,200  
Northern Border Pipeline [Member]      
Entity [Line Items]      
Net ownership percentage 50.00%    
Northern Border Pipeline [Member] | Natural Gas Pipelines      
Entity [Line Items]      
Net ownership percentage 50.00%    
Roadrunner Gas Transmission [Member]      
Entity [Line Items]      
Net ownership percentage 50.00%    
Roadrunner Gas Transmission [Member] | Natural Gas Pipelines      
Entity [Line Items]      
Net ownership percentage 50.00%    
Overland Pass Pipeline Company [Member]      
Entity [Line Items]      
Net ownership percentage 50.00%    
Overland Pass Pipeline Company [Member] | Natural Gas Liquids      
Entity [Line Items]      
Net ownership percentage 50.00%