Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	6,473
Exercised	615
Forfeited or expired	35
Stock Options Shares Outstanding, Ending balance (in shares)	5,823	6,473
Options exercisable (in shares)	4,240
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock Option Outstanding, Weighted Average Exercise Price, Beginning balance (in usd per share)	$ 19.77
Exercised	15.96
Forfeited	20.99
Stock Option Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	20.17	$ 19.77
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 20.19
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 2 months 15 days	6 years 2 months 23 days
Options exercisable, Weighted Average Remaining Contractual Term	5 years 4 months 20 days
Stock Options Outstanding, Aggregate Intrinsic Value, Beginning balance	$ 2,005
Stock Options Outstanding, Aggregate Intrinsic Value, Ending balance	13,099	$ 2,005
Options exercisable, Aggregate Intrinsic Value	$ 10,154

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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