Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Gain (Loss) on Derivative Instruments and Commodity Swap Contracts (Details)

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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Gain (Loss) on Derivative Instruments and Commodity Swap Contracts (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
$ / bbl
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / bbl
bbl
Jun. 30, 2017
USD ($)
Non-cash gains or losses on derivative contracts [Abstract]        
Cash Received (Paid) on Settled Derivatives | $ $ (12,266,857) $ 2,341,030 $ (20,396,994) $ 2,245,371
Non-Cash Mark-to-Market Gain (Loss) on Derivatives | $ (29,935,931) 14,172,002 (42,077,245) 31,228,544
Gain (Loss) on Derivative Instruments, Net | $ $ (42,202,788) $ 16,513,032 $ (62,474,239) $ 33,473,915
Total Open Commodity Swaps        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     7,500,000  
Weighted average price (in dollars per barrel) | $ / bbl 55.60   55.60  
2018        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     2,003,660  
Weighted average price (in dollars per barrel) | $ / bbl 57.83   57.83  
2019        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     3,160,000  
Weighted average price (in dollars per barrel) | $ / bbl 55.85   55.85  
2020        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     1,730,980  
Weighted average price (in dollars per barrel) | $ / bbl 52.55   52.55  
2021 and beyond        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     631,600  
Weighted average price (in dollars per barrel) | $ / bbl 55.67   55.67