Acquisitions (Narrative) (Details) |
3 Months Ended | |||||
|---|---|---|---|---|---|---|
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Aug. 31, 2018
USD ($)
a
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Jun. 05, 2017
USD ($)
a
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Feb. 13, 2017
USD ($)
a
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Mar. 31, 2018
USD ($)
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Sep. 30, 2018 |
May 19, 2017
USD ($)
|
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| 6.125% senior unsecured notes due 2024 | ||||||
| Business Acquisition [Line Items] | ||||||
| Debt instrument aggregate principal amount | $ 200,000,000 | |||||
| Debt instrument, interest rate, stated (as a percent) | 6.125% | 6.125% | ||||
| Monarch and Wildhorse | ||||||
| Business Acquisition [Line Items] | ||||||
| Consideration transferred | $ 35,900,000 | |||||
| Cimarex Energy Company | ||||||
| Business Acquisition [Line Items] | ||||||
| Consideration transferred | $ 539,519,000 | |||||
| Gas and oil area, developed and undeveloped, net (in acres) | a | 28,000 | |||||
| Ameredev | ||||||
| Business Acquisition [Line Items] | ||||||
| Consideration transferred | $ 52,500,000 | $ 646,559,000 | ||||
| Gas and oil area, developed and undeveloped, net (in acres) | a | 2,488 | 16,688 | ||||
| Gas and oil area, developed and undeveloped, gross (in acres) | a | 7,031 | 29,175 | ||||
| Working interest (as a percent) | 82.00% | |||||
| Net revenue interest (as a percent) | 75.00% |
| X | ||||||||||
- Definition Acquired Gas and Oil Area, Developed and Undeveloped, Gross No definition available.
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| X | ||||||||||
- Definition Acquired Gas and Oil Area, Developed and Undeveloped, Net No definition available.
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| X | ||||||||||
- Definition Gas and Oil Area, Net Revenue Interest No definition available.
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- Definition Gas and Oil Area, Working Interest No definition available.
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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