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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

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Amount of asset retirement obligations incurred during the period.

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