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UNCONSOLIDATED AFFILIATES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Net ownership percentage 50.00%    
Investments in unconsolidated affiliates $ 861,844 $ 969,150 $ 1,003,156
Equity method goodwill 38,800 38,800  
Equity in net earnings from investments 154,541 158,383 159,278
Impairment of equity investments 0 0 (4,270)
Balance Sheet [Abstract]      
Current assets 149,564 158,723  
Property, plant and equipment, net 2,314,631 2,413,662  
Other noncurrent assets 13,252 16,273  
Current liabilities 88,142 83,057  
Long-term debt 581,327 480,731  
Other noncurrent liabilities 76,685 47,826  
Accumulated other comprehensive income (loss) (28,373) 2,053  
Owners’ equity 1,759,666 1,974,991  
Income Statement [Abstract]      
Revenues 634,135 637,762 639,102
Operating expenses 291,210 276,373 277,121
Net income 315,274 337,694 347,692
Distributions paid to us 257,644 197,285 196,114
Accounts Payable, Related Parties, Current 13,500 14,700  
Unconsolidated Affiliates [Member]      
Income Statement [Abstract]      
Related Party Transaction, Expenses from Transactions with Related Party $ 164,700 $ 153,900 156,100
Northern Border Pipeline [Member]      
Schedule of Equity Method Investments [Line Items]      
Net ownership percentage 50.00% 50.00%  
Investments in unconsolidated affiliates $ 307,209 $ 381,623  
Equity in net earnings from investments 68,871 67,854 68,153
Income Statement [Abstract]      
Distributions paid to us 50,000    
Payments to Acquire Equity Method Investments $ 0 $ 0 83,000
Overland Pass Pipeline Company [Member]      
Schedule of Equity Method Investments [Line Items]      
Net ownership percentage 50.00% 50.00%  
Investments in unconsolidated affiliates $ 417,473 $ 429,295  
Equity in net earnings from investments $ 63,698 $ 65,887 60,067
Roadrunner Gas Transmission [Member]      
Schedule of Equity Method Investments [Line Items]      
Net ownership percentage 50.00% 50.00%  
Investments in unconsolidated affiliates $ 80,816 $ 93,857  
Equity in net earnings from investments 26,839 22,993 19,150
Other Unconsolidated Affiliates [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated affiliates 56,346 64,375  
Equity in net earnings from investments $ (4,867) $ 1,649 $ 11,908