Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
FAIR VALUE - Assets and Liabilities Accounted For At Fair Value On A Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Consideration – Current Liabilities $ (37,160) $ (58,069)
Debt Exchange Derivatives – Current Liabilities (9,225) (18,183)
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Liabilities) (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity Derivatives – Current Asset (crude oil price and basis swaps) 0 0
Commodity Derivatives – Noncurrent Asset (crude oil price swaps) 0 0
Commodity Derivatives – Current Liabilities (crude oil price and basis swaps) 0  
Commodity Derivatives – Noncurrent Liabilities (crude oil price swaps) 0  
Contingent Consideration – Current Liabilities 0 0
Debt Exchange Derivatives – Current Liabilities 0 0
Total 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity Derivatives – Current Asset (crude oil price and basis swaps) 18,578 115,870
Commodity Derivatives – Noncurrent Asset (crude oil price swaps) 17,839 61,843
Commodity Derivatives – Current Liabilities (crude oil price and basis swaps) (5,882)  
Commodity Derivatives – Noncurrent Liabilities (crude oil price swaps) (4,991)  
Contingent Consideration – Current Liabilities 0 0
Debt Exchange Derivatives – Current Liabilities 0 0
Total 25,544 177,713
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity Derivatives – Current Asset (crude oil price and basis swaps) 0 0
Commodity Derivatives – Noncurrent Asset (crude oil price swaps) 0 0
Commodity Derivatives – Current Liabilities (crude oil price and basis swaps) 0  
Commodity Derivatives – Noncurrent Liabilities (crude oil price swaps) 0  
Contingent Consideration – Current Liabilities (37,160) (58,069)
Debt Exchange Derivatives – Current Liabilities (9,225) (18,183)
Total $ (46,385) $ (76,252)