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ACQUISITIONS AND DIVESTITURES-Monument Draw Assets (Details) $ in Millions | Jan. 09, 2018 USD ($) | Dec. 13, 2017 USD ($) | Jun. 15, 2017 USD ($) | Dec. 09, 2016 item $ / a | Jun. 14, 2017 $ / a
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ACQUISITIONS AND DIVESTITURES |  |  |  |  |
Number of tracts | item |  |  |  | 2 |
Ward County Texas Assets |  |  |  |  |
ACQUISITIONS AND DIVESTITURES |  |  |  |  |
Purchase price |  | $ 101.8 |  |  |
Southern Tract | Ward County Texas Assets |  |  |  |  |
ACQUISITIONS AND DIVESTITURES |  |  |  |  |
Price per Acre | $ / a |  |  |  | 11,000 | 13,000
Purchase price |  |  | $ 87.4 |  |
Northern Tract | Ward County Texas Assets |  |  |  |  |
ACQUISITIONS AND DIVESTITURES |  |  |  |  |
Price per Acre | $ / a |  |  |  | 11,000 | 13,000
Purchase price | $ 108.2 |  |  |  |

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