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Stock Compensation - Weighted Average Assumptions (Details) - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Weighted-average fair value of grant (in dollars per share)	$ 40.02	$ 28.33
Risk-free interest rate	0.27%	1.35%
Expected volatility	57.08%	51.81%
Expected life of restricted stock units in years	2 years 10 months 2 days	2 years 10 months 9 days
Expected dividend yield	0.00%	0.00%

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (c)(2)(iii)(1)
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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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- Definition

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

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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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