Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS (Details)

v3.19.1
SUBSEQUENT EVENTS (Details)
shares in Millions
1 Months Ended 3 Months Ended
Apr. 26, 2019
USD ($)
shares
Apr. 30, 2019
USD ($)
$ / bbl
shares
bbl
Mar. 31, 2019
USD ($)
$ / MMBTU
Mar. 31, 2018
USD ($)
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Subsequent Event [Line Items]            
Amount of shares repurchased     $ 28,330,000 $ 99,997,000    
Stock repurchase program, amount authorized to acquire         $ 400,000,000.0 $ 100,000,000
Fixed Price Swap 2019            
Subsequent Event [Line Items]            
Weighted average price (in usd per Bbl) | $ / MMBTU     3.05      
Subsequent Event            
Subsequent Event [Line Items]            
Shares repurchased (in shares) | shares 3.8 0.2        
Amount of shares repurchased $ 30,000,000 $ 1,800,000        
Stock repurchase program, amount authorized to acquire $ 370,000,013          
Subsequent Event | Fixed Price Swap 2019 | Oil derivatives            
Subsequent Event [Line Items]            
Daily Volume (Bbls/day) | bbl   3,000        
Weighted average price (in usd per Bbl) | $ / bbl   61.55        
Subsequent Event | Fixed Price Swap 2019 | C5 Pentane            
Subsequent Event [Line Items]            
Daily Volume (Bbls/day) | bbl   500        
Weighted average price (in usd per Bbl) | $ / bbl   53.34        
Subsequent Event | Fixed Price Swap 2020            
Subsequent Event [Line Items]            
Daily Volume (Bbls/day) | bbl   6,000        
Weighted average price (in usd per Bbl) | $ / bbl   59.82