Equity-based Compensation Plans - Restricted Stock Units (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Plans
Intrinsic value of unvested units	$ 16,700	$ 11,800	$ 5,600
Actual tax benefit for the tax deductions from the vesting of restricted stock units	$ 2,100	$ 700	$ 700
2016 Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Plans
Grant date fair value (per unit)	$ 32.54	$ 11.17	$ 25.73
Intrinsic value of unvested units	$ 88,400
Unrecognized compensation costs recognition period (in years)	3 years 10 months 24 days
Restricted Stock Units
Outstanding at December 31, 2019 (in shares)	1,806
Granted (in shares)	2,520
Vested (in shares)	(661)
Forfeited (in shares)	(273)
Outstanding at September 30, 2020 (in shares)	3,392	1,806
Weighted Average Grant Date Fair Value
Weighted average grant date fair value (per share)		$ 19.68
Granted (per share)	$ 32.54	$ 11.17	$ 25.73
Vested (per share)	20.83
Forfeited (per share)	24.40
Vesting delayed by deferral conditions (per share)	$ 28.87

Amount of tax benefit from vesting of restricted stock units under share-based compensation arrangement.

No definition available.

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- Definition

The weighted average fair value of Vesting delayed on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units

+ References

No definition available.

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- Definition

Number of shares under non-option equity instrument agreements that were vested as a result of occurrence of a terminating event

+ References

No definition available.

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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.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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- Definition

Net number of non-option equity instruments granted to participants.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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 (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

+ References

No definition available.

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