Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

v3.19.1
FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Liabilities:      
Asset retirement obligation capitalized $ 969 $ 329  
Level 1      
Assets:      
Derivative Instruments 0   $ 0
Liabilities:      
Derivative Instruments 0   0
Level 2      
Assets:      
Derivative Instruments 17,958   21,352
Liabilities:      
Derivative Instruments 26,208   34,393
Level 3      
Assets:      
Derivative Instruments 0   0
Liabilities:      
Derivative Instruments $ 0   $ 0