SHARE BASED COMPENSATION, 401(K) PLAN AND DEFERRED COMPENSATION - Option Activity (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding at beginning of year (in shares)	964,359
Exercised (in shares)	(629,798)
Outstanding at end of year, shares (in shares)	334,561	964,359
Vested/Exercisable at end of year (in shares)	334,561
Weighted Average Exercise Price
Outstanding at beginning of year, Weighted Average Exercise Price (in dollars per shares)	$ 9.13
Exercised, Weighted Average Exercise Price (in dollars per shares)	7.67
Outstanding at end of year, Weighted Average Exercise price (in dollars per shares)	11.88	$ 9.13
Vested/Exercisable at end of period, Weighted Average Exercise Price (in dollars per shares)	$ 11.88
Weighted Average Remaining Contractual Term (in years)	1 year	1 year 3 months 18 days
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	1 year
Exercised, Aggregated Intrinsic Value	$ 4,967,700
Outstanding, Aggregate Intrinsic Value	1,295,900
Vested/Exercisable at end of year, Aggregate Intrinsic Value	$ 1,295,900

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 weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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