Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Cash Settlements on Liquidated Derivative Instruments and Non-Cash Gains and Losses on Open Derivative Instruments (Details)

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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Cash Settlements on Liquidated Derivative Instruments and Non-Cash Gains and Losses on Open Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Non-cash gains or losses on derivative contracts [Abstract]        
Cash Received (Paid) on Settled Derivatives $ 18,386 $ (12,923) $ 35,666 $ (33,320)
Non-Cash Mark-to-Market Gain (Loss) on Derivatives 57,506 (30,225) (62,806) (72,303)
Gain (Loss) on Derivative Instruments, Net 75,892 $ (43,148) (27,139) $ (105,622)
Net cash proceeds from crude oil derivative contracts $ 7,400   $ 7,400