Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE - Assets and Liabilities Accounted For At Fair Value On A Recurring Basis (Details)

v3.20.2
FAIR VALUE - Assets and Liabilities Accounted For At Fair Value On A Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Quoted Prices In Active Markets for Identical Assets (Liabilities) (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) $ 0 $ 0
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 118,401 (5,195)
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0 0
Commodity Contract | Current Asset | Quoted Prices In Active Markets for Identical Assets (Liabilities) (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0 0
Commodity Contract | Current Asset | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 119,468 5,628
Commodity Contract | Current Asset | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0 0
Commodity Contract | Noncurrent Asset | Quoted Prices In Active Markets for Identical Assets (Liabilities) (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0 0
Commodity Contract | Noncurrent Asset | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 6,826 8,554
Commodity Contract | Noncurrent Asset | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0 0
Commodity Contract | Current Liabilities | Quoted Prices In Active Markets for Identical Assets (Liabilities) (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0 0
Commodity Contract | Current Liabilities | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) (4,908) (11,298)
Commodity Contract | Current Liabilities | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0 0
Commodity Contract | Noncurrent Liabilities | Quoted Prices In Active Markets for Identical Assets (Liabilities) (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0 0
Commodity Contract | Noncurrent Liabilities | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) (1,781) (8,079)
Commodity Contract | Noncurrent Liabilities | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0 $ 0
Interest Rate Contract | Current Liabilities | Quoted Prices In Active Markets for Identical Assets (Liabilities) (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0  
Interest Rate Contract | Current Liabilities | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) (530)  
Interest Rate Contract | Current Liabilities | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0  
Interest Rate Contract | Noncurrent Liabilities | Quoted Prices In Active Markets for Identical Assets (Liabilities) (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) 0  
Interest Rate Contract | Noncurrent Liabilities | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) (675)  
Interest Rate Contract | Noncurrent Liabilities | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets (liabilities) $ 0