Compensation plans - Assumptions used to estimate fair value of performance unit awards (Details) - $ / shares	12 Months Ended
Dec. 31, 2021	Mar. 05, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing stock price on grant date (in dollars per share)		$ 34.24
March 09, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Share Unit Matrix	50.00%
EBITDAX/Total Debt Component (as a percent)	25.00%
Inventory Growth Component (as a percent)	25.00%
Performance unit awards \| March 5, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per performance share award (USD per share)	$ 91.31
Expense per performance share award (in dollars per share)	91.31
Performance unit awards \| March 09, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per performance share award (USD per share)	90.92
Expense per performance share award (in dollars per share)	$ 90.92
Performance unit awards with market criteria \| March 5, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected option life (in years)	1 year
Risk-free interest rate (as a percent)	0.39%
Dividend yield (as a percent)	0.00%
Expected volatility (as a percent)	86.17%
Closing stock price on grant date (in dollars per share)	$ 60.13
Fair value per performance share award (USD per share)	195.77
Expense per performance share award (in dollars per share)	$ 195.77
Performance unit awards with market criteria \| March 09, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected option life (in years)	2 years
Risk-free interest rate (as a percent)	0.73%
Dividend yield (as a percent)	0.00%
Expected volatility (as a percent)	135.42%
Closing stock price on grant date (in dollars per share)	$ 60.13
Fair value per performance share award (USD per share)	121.72
Expense per performance share award (in dollars per share)	121.72
Performance unit awards with performance criteria \| March 5, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing stock price on grant date (in dollars per share)	$ 60.13
Estimated payout for expense (as a percent)	130.00%
Fair value per performance share award (USD per share)	$ 60.13
Expense per performance share award (in dollars per share)	78.17
Performance unit awards with performance criteria \| March 09, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing stock price on grant date (in dollars per share)	$ 60.13
Estimated payout for expense (as a percent)	100.00%
Fair value per performance share award (USD per share)	$ 60.13
Expense per performance share award (in dollars per share)	$ 60.13

Estimated Probability Of Criteria Being Earned Over Performance Period

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- Definition

Performance Multiple Weight, Earnings Before Interest, Taxes, Depreciation And Amortization, Debt Component

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- Definition

Performance Multiple Weight Inventory Growth Component

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- Definition

Performance Multiple Weight Share Unit Matrix

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Expense Per Performance Share Award

+ References

No definition available.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- 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.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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