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Derivatives - Narrative (Details)
bbl in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
Dec. 31, 2019
$ / bbl
bbl
Jun. 30, 2016
USD ($)
Credit Derivatives [Line Items]      
Derivative contracts, barrels   260  
Derivative, average fixed interest rate   3.91%  
Option Collars      
Credit Derivatives [Line Items]      
Derivative contracts, barrels   75  
Commodity derivatives      
Credit Derivatives [Line Items]      
Derivative contracts, barrels   260  
Interest Rate Swap      
Credit Derivatives [Line Items]      
Notional amount | $ $ 100,000,000    
Termination of derivative gain (loss) | $ $ 3,700,000    
Long      
Credit Derivatives [Line Items]      
Derivative contracts, barrels   3,360  
Long | Commodity derivatives      
Credit Derivatives [Line Items]      
Derivative contracts, barrels   3,360  
Short      
Credit Derivatives [Line Items]      
Derivative contracts, barrels   3,100  
Short | Commodity derivatives      
Credit Derivatives [Line Items]      
Derivative contracts, barrels   3,100  
5% Convertible Senior Notes due 2021      
Credit Derivatives [Line Items]      
Debt instrument, interest rate   5.00% 5.00%
5% Convertible Senior Notes due 2021 | Convertible Debt      
Credit Derivatives [Line Items]      
Aggregate principal amount | $     $ 115,000,000
Debt instrument, interest rate   5.00%  
Minimum | Option Collars      
Credit Derivatives [Line Items]      
Derivative, average price risk option strike price | $ / bbl   48.77  
Maximum | Option Collars      
Credit Derivatives [Line Items]      
Derivative, average price risk option strike price | $ / bbl   65.00