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Share-Based Compensation - Stock Options Activity (Details) - 2012 Equity Incentive Plan - Stock options - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock Options
Options outstanding at beginning of period	1,090,300	1,529,800
Granted	0	0
Exercised	(60,000)	(83,600)
Forfeited	0	(1,600)
Options outstanding at end of period	1,030,300	1,444,600
Options exercisable at end of period	992,800	1,296,750

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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