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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
bbl in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2023
May 10, 2024
USD ($)
Dec. 31, 2023
USD ($)
Oct. 01, 2022
bbl
Accounting Policies [Line Items]            
Assets $ 2,344,681,000       $ 2,379,609,000  
Liabilities 1,681,940,000       1,641,518,000  
Capitalized interest 1,000,000 $ 1,400,000        
Repairs and maintenance costs 5,200,000 4,300,000        
Goodwill 275,367,000       275,367,000  
Barrels for storage capacity in operation | bbl           6.2
Goodwill, impairment 0 0        
Less: Debt issuance costs (29,448,000)       (31,301,000)  
Amortization of deferred financing costs 1,929,000 $ 1,429,000        
Other current assets 46,321,000       42,034,000  
Other assets 70,659,000       57,253,000  
Capitalized Contract Cost, Net, Noncurrent 24,900,000       17,600,000  
Total debt 1,373,637,000       1,372,211,000  
Capitalized Contract Cost, Net, Noncurrent 24,900,000       17,600,000  
Deferred Revenue, Revenue Recognized 300,000          
Other receivables 8,437,000       5,716,000  
Total debt 1,373,637,000       1,372,211,000  
Bonds payable            
Accounting Policies [Line Items]            
Total debt 1,265,587,000       1,264,161,000  
Total debt 1,265,587,000       1,264,161,000  
Series 2024 Bonds | Bonds payable | Subsequent Event            
Accounting Policies [Line Items]            
Total debt       $ 276,000,000    
Total debt       $ 276,000,000    
Corporate and Other            
Accounting Policies [Line Items]            
Assets 19,582,000       16,218,000  
Liabilities 603,380,000       $ 585,621,000  
Measurement Input, Discount Rate | Goodwill            
Accounting Policies [Line Items]            
Alternative investment, measurement input         0.103  
Measurement Input, Growth Rate | Goodwill            
Accounting Policies [Line Items]            
Alternative investment, measurement input         0.025  
Jefferson Terminal            
Accounting Policies [Line Items]            
Goodwill 122,700,000       $ 122,700,000  
Capitalized Contract Cost, Net, Noncurrent 24,900,000       17,600,000  
Capitalized Contract Cost, Net, Noncurrent 24,900,000       17,600,000  
Railroad            
Accounting Policies [Line Items]            
Goodwill 147,200,000       147,200,000  
Corporate and Other [Member]            
Accounting Policies [Line Items]            
Goodwill 5,400,000       5,400,000  
CarbonFree            
Accounting Policies [Line Items]            
Other assets 11,700,000       11,700,000  
Other Assets            
Accounting Policies [Line Items]            
Notes receivable 21,425,000       21,425,000  
Other current assets 7,085,000       5,963,000  
Prepaid expense $ 9,374,000       8,930,000  
Customer One | Customer Concentration Risk | Sales Revenue, Segment | Jefferson Terminal            
Accounting Policies [Line Items]            
Concentration risk 14.00% 12.00%        
Customer One | Customer Concentration Risk | Sales Revenue, Segment | Railroad            
Accounting Policies [Line Items]            
Concentration risk 51.00% 48.00%        
Three Customers | Customer Concentration Risk | Accounts Receivable            
Accounting Policies [Line Items]            
Concentration risk 54.00%   56.00%      
Delaware River Partners LLC | Variable Interest Entity, Primary Beneficiary            
Accounting Policies [Line Items]            
Interest held in VIE, as a percentage 100.00%          
Assets $ 303,300,000       305,000,000  
Liabilities $ 55,400,000       $ 52,700,000