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Stock-Based Compensation - Stock option activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares
Beginning balance (in shares)	5,789	6,589	34,123
Issued (in shares)	0	2,500	0
Exercised (in shares)	0	(3,300)	(26,784)
Forfeited (in shares)	0	0	(750)
Ending balance (in shares)	5,789	5,789	6,589
Weighted- Average Exercise  Price
Beginning balance (in dollars per share)	$ 36.96	$ 19.99	$ 14.69
Issued (in dollars per share)	0	47.95	0
Exercised (in dollars per share)	0	11.40	12.42
Forfeited (in dollars per share)	0	0	49.08
Ending balance (in dollars per share)	$ 36.96	$ 36.96	$ 19.99
Stock options exercisable (in shares)	4,122	3,289	6,214
Weighted average exercise price (in dollars per share)	$ 32.51	$ 28.60	$ 18.18

X

- Definition

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.

+ References

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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.

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Gross number of share options (or share units) granted during the period.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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