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DEBT (Credit Agreements) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jul. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 28, 2013
USD ($)
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate During Period 3.38% 3.40% 3.40% 3.41%      
Amortization of Financing Costs $ 200,000 $ 200,000 $ 437,000 $ 398,000      
Interest expense for long-term debt 2,000,000 2,500,000 3,900,000 4,800,000      
Capitalized interest 100,000 100,000 100,000 200,000      
Derivative, Notional Amount 200,000,000   200,000,000        
Interest rate swaps liability 3,663,000   3,663,000     $ 2,634,000  
Interest Expense, Other 800,000 0 $ 1,400,000 0      
Blueknight General Partners G. P., L.L.C. [Member]              
Debt Instrument [Line Items]              
Credit agreement, Constitute a change of control, if ceases to own, directly or indirectly, exactly 50% of the membership interests of the General Partner or if General Partner ceases to be controlled (as a percent)     100.00%        
Vitol or Charlesbank [Member]              
Debt Instrument [Line Items]              
Credit agreement, Constitute a change of control if Vitol Holding BV and Charlesbank ceasing to collectively own and control 50% of the GP     50.00%        
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Revolving credit facility amount             $ 400,000,000
Maximum borrowing capacity including additional lenders $ 500,000,000   $ 500,000,000        
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 3.50   3.50        
Consolidated interest coverage (as a ratio), actual 7.31   7.31        
Debt issuance costs $ 0 $ 0 $ 0 $ 0      
Weighted average interest rate (as a percent) 3.34%   3.34%        
Revolving Credit Facility [Member] | Minimum [Member]              
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] | Maximum [Member]              
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         $ 236,000,000    
Unused borrowing capacity         162,800,000    
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] | Minimum [Member]              
Debt Instrument [Line Items]              
Applicable margin interest rate increase (as a percent)     1.00%        
Revolving Credit Facility [Member] | Applicable margin based on ABR [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Applicable margin interest rate increase (as a percent)     2.00%        
Revolving Credit Facility [Member] | Applicable margin based on Eurodollar rate [Member] | Minimum [Member]              
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] | Maximum [Member]              
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, amount         $ 1,200,000    
Interest Rate Swap [Member]              
Debt Instrument [Line Items]              
Derivative, Notional Amount $ 100,000,000   $ 100,000,000        
Derivative, Fixed Interest Rate 1.45%   1.45%        
Interest Rate Swap Two [Member]              
Debt Instrument [Line Items]              
Derivative, Notional Amount $ 100,000,000   $ 100,000,000        
Derivative, Fixed Interest Rate 1.97%   1.97%        
Aggregate Principal Below Threshold [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Consolidated total leverage (as a ratio), Maximum permitted 4.50   4.50        
Minimum Acquisition Costs     $ 10,000,000.0        
Minimum Percent of Projected Capital Expenditures     50.00%        
Minimum Capital Expenditure     $ 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 5.00   5.00        
Provision One, 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 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 4.75   4.75        
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 4.50   4.50        
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 5.50   5.50        
Provision Two, 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 5.50   5.50        
Provision Three, 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 5.00   5.00        
Provision Two, 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 5.00   5.00