Maximum period stock options, appreciation rights, restricted stock, and restricted stock units can be granted

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- Definition

Number of years stock based compensation is exercisable after grant date

+ References

No definition available.

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- Definition

Restricted stock units outstanding vested but not yet paid because the payout date had been deferred by the holder

+ References

No definition available.

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- Definition

Stock price floor at which a portion of the deferred compensation plan award would be paid partially in cash.

+ References

No definition available.

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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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.

+ References

No definition available.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB
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Stock Compensation Plans Narrative (Details) - USD ($)	12 Months Ended
Stock Compensation Plans Narrative (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum period stock options, appreciation rights, restricted stock, and restricted stock units can be granted	10 years
Number of Years Stock Options are Exercisable After Grant Date	10 years
Number of shares available for grant	23,100,000
Long-term incentive plan liability	$ 19,100,000	$ 15,000,000.0
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation vesting period	4 years
Unrecognized stock compensation expense	$ 0
Aggregate instrinsic value of stock options exercised	$ 400,000	$ 10,500,000	$ 11,700,000
Exercise price (in dollars per share)	$ 8	$ 8	$ 12	$ 11
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation vesting period	3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding vested but not yet paid	200,000
Restricted Stock, Performance Shares, and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock compensation expense	$ 20,600,000
Restricted stock shares vested during period, total fair value	$ 20,400,000	$ 20,000,000.0	$ 17,100,000
Weighted average period in which stock based compensation costs are expensed	2 years
Field long-term compensation plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation vesting period	3 years
Senior management long-term compensation plan [Member] [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation plan price floor	$ 5.00