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DEBT (Credit Agreements) (Details)
3 Months Ended 9 Months Ended
Jun. 28, 2018
USD ($)
May 11, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Oct. 25, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                
Maximum quarterly distribution         $ 10,700,000      
Write-off of deferred debt issuance costs   $ 700,000            
Debt issuance costs, noncurrent, net     $ 3,600,000   3,600,000     $ 4,442,000
Payments for Debt issuance costs         358,000 $ 4,172,000    
Amortization of debt issuance costs     251,000 $ 252,000 764,000 867,000    
Interest expense for long-term debt     4,100,000 3,500,000 12,600,000 10,200,000    
Long-term Debt, Excluding Current Maturities     271,592,000   271,592,000     307,592,000
Derivative, Notional Amount     100,000,000   100,000,000     $ 200,000,000
Interest Expense, Other       $ 300,000   $ 1,100,000    
Interest Income, Other     100,000   $ 100,000      
Blueknight General Partners G. P., L.L.C. [Member]                
Debt Instrument [Line Items]                
Credit agreement change of control provision, General Partner ownership minimum         100.00%      
Ergon [Member]                
Debt Instrument [Line Items]                
Credit agreement change of control provision, Ergon minimum control percentage         50.00%      
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Revolving credit facility amount $ 450,000,000   400,000,000   $ 400,000,000      
Maximum borrowing capacity including additional lenders     $ 600,000,000   $ 600,000,000      
Debt instrument maximum covenant consolidated senior secured leverage ratio     3.50   3.50      
Consolidated interest coverage (as a ratio), minimum permitted     2.50   2.50      
Consolidated total leverage (as a ratio), actual     5.39   5.39      
Consolidated interest coverage (as a ratio), actual     3.32   3.32      
Write-off of deferred debt issuance costs $ 400,000              
Debt issuance costs, noncurrent, net   $ 900,000            
Debt instrument, interest rate during period     5.65% 4.54% 5.33% 4.36%    
Payments for Debt issuance costs     $ 49,000 $ 155,000 $ 400,000 $ 4,172,000    
Revolving Credit Facility [Member] | Min                
Debt Instrument [Line Items]                
Unused capacity, commitment fee (as a percent)         0.375%      
Debt instrument covenant, issued qualified senior notes     $ 200,000,000   $ 200,000,000      
Revolving Credit Facility [Member] | Max                
Debt Instrument [Line Items]                
Unused capacity, commitment fee (as a percent)         0.50%      
Revolving Credit Facility [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Revolver borrowings             $ 257,600,000  
Unused borrowing capacity             138,200,000  
Revolving Credit Facility [Member] | Federal funds rate [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)         0.50%      
Revolving Credit Facility [Member] | Eurodollar rate [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)         1.00%      
Revolving Credit Facility [Member] | Applicable margin based on ABR [Member] | Min                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)         1.00%      
Revolving Credit Facility [Member] | Applicable margin based on ABR [Member] | Max                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)         2.00%      
Revolving Credit Facility [Member] | Applicable margin based on Eurodollar rate [Member] | Min                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)         2.00%      
Revolving Credit Facility [Member] | Applicable margin based on Eurodollar rate [Member] | Max                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)         3.00%      
Letter of Credit [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Letters of credit outstanding             $ 4,200,000  
Aggregate Principal Below Threshold [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Consolidated total leverage (as a ratio), maximum permitted     4.75   4.75      
Minimum acquisition costs         $ 15,000,000.0      
Debt instrument covenant, issued qualified senior notes     $ 200,000,000   200,000,000      
Aggregate Principal Above Threshold [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Debt instrument covenant, issued qualified senior notes     $ 200,000,000   $ 200,000,000      
Provision One, Applicable Period One [Member] | Aggregate Principal Below Threshold [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Consolidated total leverage (as a ratio), maximum permitted     5.50   5.50      
Provision One, Applicable Period Two [Member] | Aggregate Principal Below Threshold [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Consolidated total leverage (as a ratio), maximum permitted     5.25   5.25      
Provision One, Applicable Period Three [Member] | Aggregate Principal Below Threshold [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Consolidated total leverage (as a ratio), maximum permitted     5.00   5.00      
Provision One, Applicable Period Four [Member] | Aggregate Principal Below Threshold [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Consolidated total leverage (as a ratio), maximum permitted     4.75   4.75      
Provision Two, Applicable Period One [Member] | Aggregate Principal Below Threshold [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Consolidated total leverage (as a ratio), maximum permitted     5.25   5.25      
Provision Three, Applicable Period One [Member] | Aggregate Principal Above Threshold [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Consolidated total leverage (as a ratio), maximum permitted     5.00   5.00      
Provision Three, Applicable Period Two [Member] | Aggregate Principal Above Threshold [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Consolidated total leverage (as a ratio), maximum permitted     5.50   5.50