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)

v3.19.2
DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Gain (Loss) on Derivative Instruments and Commodity Swap Contracts (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
$ / bbl
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / bbl
bbl
Jun. 30, 2018
USD ($)
Non-cash gains or losses on derivative contracts [Abstract]        
Cash Received (Paid) on Settled Derivatives | $ $ 4,734 $ (12,267) $ 17,280 $ (20,397)
Non-Cash Mark-to-Market Gain (Loss) on Derivatives | $ 31,857 (29,936) (120,311) (42,077)
Gain (Loss) on Derivative Instruments, Net | $ $ 36,591 $ (42,203) $ (103,031) $ (62,474)
Total Open Commodity Swaps        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     15,400,000  
Weighted average price (in dollars per barrel) | $ / bbl 59.91   59.91  
2019        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     4,164,280  
Weighted average price (in dollars per barrel) | $ / bbl 62.96   62.96  
2020        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     7,848,330  
Weighted average price (in dollars per barrel) | $ / bbl 59.31   59.31  
2021        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     2,906,350  
Weighted average price (in dollars per barrel) | $ / bbl 57.96   57.96  
2022 and beyond        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     500,000  
Weighted average price (in dollars per barrel) | $ / bbl 55.06   55.06  
Basis Swap Contracts        
Non-cash gains or losses on derivative contracts [Abstract]        
Oil (in barrels) | bbl     1,840,000  
Weighted average price (in dollars per barrel) | $ / bbl (2.41)   (2.41)