Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Reconciliation between the gross assets and liabilities and the amounts reflected on the balance sheet (Details)

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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Reconciliation between the gross assets and liabilities and the amounts reflected on the balance sheet (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Offsetting Assets [Line Items]    
Current liabilities $ (43,644,644) $ (18,681,891)
Noncurrent liabilities (28,611,421) (11,496,929)
Total derivative liabilities (72,256,065) (30,178,820)
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 26,580 0
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (26,580) 0
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 0 0
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (72,282,645) (30,178,820)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 26,580 0
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (72,256,065) (30,178,820)
Current Assets    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 12,921 0
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (12,921) 0
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 0 0
Noncurrent Assets    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 13,659 0
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (13,659) 0
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 0 0
Current Liabilities    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (43,657,565) (18,681,891)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 12,921 0
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (43,644,644) (18,681,891)
Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (28,625,080) (11,496,929)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 13,659 0
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (28,611,421) (11,496,929)
Swap Contracts | Current Liabilities    
Offsetting Assets [Line Items]    
Current liabilities (43,644,644) (18,681,891)
Swap Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities $ (28,611,421) $ (11,496,929)