Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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FAIR VALUE MEASUREMENTS (Details) $ in Thousands	3 Months Ended		6 Months Ended
FAIR VALUE MEASUREMENTS (Details) $ in Thousands	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 12, 2019 USD ($)
Fair Value Disclosures [Abstract]
Unrealized derivative instrument loss	$ (10,585)	$ 0	$ (72,569)	$ 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Embedded derivative liability	$ 175,498		$ 175,498		$ 102,929	$ 94,459
Interest Rate Volatility \| Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Embedded derivative liability, measurement input	0.3556		0.3556		0.2189
Minimum \| Altus Midstream Company’s Imputed Interest Rate \| Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Embedded derivative liability, measurement input	0.1416		0.1416		0.0960
Maximum \| Altus Midstream Company’s Imputed Interest Rate \| Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Embedded derivative liability, measurement input	0.1557		0.1557		0.1268