Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

v3.19.3.a.u2
FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Liabilities:      
Asset retirement obligation capitalized $ 5,769 $ 1,468  
Level 1      
Assets:      
Derivative Instruments 0   $ 0
Liabilities:      
Derivative Instruments 0   0
Level 2      
Assets:      
Derivative Instruments 157,990   21,352
Liabilities:      
Derivative Instruments 72,469   34,393
Level 3      
Assets:      
Derivative Instruments 0   0
Liabilities:      
Derivative Instruments $ 0   $ 0