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Share-Based Compensation - Stock Options Activity (Details) - 2021 Employee Stock Purchase Plan - Stock options - shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Stock Options
Options outstanding at beginning of period	1,090,300	1,529,800
Granted	0	0
Exercised	(259,000)	(333,650)
Forfeited	0	(2,850)
Options outstanding at end of period	831,300	1,193,300
Options exercisable at end of period	793,800	1,049,200

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.

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- Definition

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

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