Property Acquisitions and Divestiture - Additional Information (Details)
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6 Months Ended |
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Mar. 02, 2018
USD ($)
a
Wells
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Feb. 08, 2018
USD ($)
a
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Jun. 30, 2018
USD ($)
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Jun. 30, 2017
USD ($)
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Dec. 31, 2017
USD ($)
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Dec. 21, 2017
USD ($)
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| Business Acquisition [Line Items] |
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| Purchase price of undeveloped net acres |
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$ 107,193,000
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$ 405,244,000
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| Unproved properties acquired |
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1,838,303,000
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$ 1,952,680,000
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| Proved properties |
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2,101,875,000
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$ 1,602,002,000
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| Proceeds from sale |
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$ 146,090,000
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$ 10,675,000
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| Northern Delaware Basin |
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| Business Acquisition [Line Items] |
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| Undeveloped net acres acquired | a |
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4,000
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| Purchase price of undeveloped net acres |
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$ 94,700,000
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| Gas and oil area, working interest, percent |
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92.00%
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| Amount placed in escrow |
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$ 8,600,000
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| Settlement adjustments |
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$ 200,000
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| Net purchase price of undeveloped net acres |
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94,500,000
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| Unproved properties acquired |
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80,700,000
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| Proved properties |
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13,800,000
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| Capitalized transaction costs |
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$ 200,000
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| Reeves County |
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| Business Acquisition [Line Items] |
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| Undeveloped net acres acquired | a |
8,600
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| Number of wells sold (in wells) | Wells |
12
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| Proceeds from sale |
$ 140,700,000
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| Average working interest |
32.00%
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| Gain (loss) on sale |
$ 0
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