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Share-Based Compensation - Stock Options Activity (Details) - 2012 Equity Incentive Plan - Stock options - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Stock Options
Options outstanding at beginning of period	1,529,800	2,252,275
Granted	0	20,000
Exercised	(255,550)	(650,375)
Forfeited	(2,850)	(12,350)
Options outstanding at end of period	1,271,400	1,609,550
Options exercisable at end of period	1,124,800	1,240,400

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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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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