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Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock option activity
Options outstanding (in shares)	121,120	154,440	232,870
Options exercised (in shares)	(43,500)	(32,120)	(74,030)
Options forfeited (in shares)	(550)	(1,200)	(4,400)
Options outstanding (in shares)	77,070	121,120	154,440
Stock option activity, weighted average exercise price
Options Outstanding, weighted average exercise price (in dollars per share)	$ 8.73	$ 8.68	$ 9.13
Options exercised, weighted average exercise price (in dollars per share)	6.39	8.59	9.97
Options canceled, weighted average exercise price (in dollars per share)	7.40	5.55	10.85
Options Outstanding, weighted average exercise price (in dollars per share)	$ 10.06	$ 8.73	$ 8.68
Options vested or expected to vest (in shares)	77,070
Options exercisable (in shares)	77,070
Options vested or expected to vest, weighted average exercise price (in dollars per share)	$ 10.06
Options exercisable, weighted average exercise price (in dollars per share)	$ 10.06
Options outstanding, weighted average remaining contractual term	1 year 6 months 3 days	2 years 21 days	2 years 9 months 21 days
Options vested or expected to vest, weighted average remaining contractual term	1 year 6 months 3 days
Options exercisable, weighted average remaining contractual term	1 year 6 months 3 days
Options outstanding, aggregate intrinsic value	$ 382,291	$ 1,567	$ 1,554
Options vested or expected to vest, aggregate intrinsic value	382,291
Options exercisable, aggregate intrinsic value	$ 382,291

X

- Definition

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

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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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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