Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

v3.19.2
FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Liabilities:      
Asset retirement obligation capitalized $ 5,153 $ 909  
Level 1      
Assets:      
Derivative Instruments 0   $ 0
Liabilities:      
Derivative Instruments 0   0
Level 2      
Assets:      
Derivative Instruments 139,956   21,352
Liabilities:      
Derivative Instruments 408   34,393
Level 3      
Assets:      
Derivative Instruments 0   0
Liabilities:      
Derivative Instruments $ 0   $ 0