Incentive Plans - Share Based Incentive Award Activity (Details)	9 Months Ended
Sep. 30, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance outstanding (in shares)	86,332
Awards granted (in shares)	0
Awards forfeited (in shares)	0
Awards vested (in shares)	0
Options exercised (in shares)	(55,173)
Options expired (in shares)	(415)
Ending balance outstanding (in shares)	30,744
Restricted Stock Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance outstanding (in shares)	765,981
Awards granted (in shares)	304,142
Awards vested (in shares)	(562,752)
Awards exercised (in shares)	0
Ending balance outstanding (in shares)	755,421
Restricted Stock Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance outstanding (in shares)	221,353
Awards granted (in shares)	71,870
Awards vested (in shares)	(100,956)
Awards exercised (in shares)	0
Ending balance outstanding (in shares)	186,419
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance outstanding (in shares)	207,430
Awards granted (in shares)	173,423
Awards vested (in shares)	(100,056)
Awards exercised (in shares)	0
Ending balance outstanding (in shares)	380,853
Parsley
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Awards granted (in shares)	0
Parsley \| Restricted Stock Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Awards granted (in shares)	255,379
Awards forfeited (in shares)	(7,329)
Assumption and accelerated vested awards (in shares)	(216,914)
Parsley \| Restricted Stock Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Awards granted (in shares)	0
Awards forfeited (in shares)	(5,848)
Parsley \| Performance Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Awards granted (in shares)	100,056
Awards forfeited (in shares)	0

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of non-option equity instruments exercised by participants.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of shares for which recognition of cost was accelerated for award under share-based payment arrangement.

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Number of non-vested options outstanding.

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Number of options vested.

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Number of share options (or share units) exercised during the current period.

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