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Equity-Based Compensation Plan (Summary of the range of exercise prices and the weighted average remaining contractual life of the options) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of Options Outstanding	481,444	634,294	739,326	845,619
Weighted Average Exercise Price outstanding	$ 15.10	$ 14.60	$ 14.28	$ 14.14
Weighted Average Contractual Life Remaining	2 years 8 months 12 days
Number of Options Exercisable	481,444
Weighted Average Exercise Price	$ 15.10
Aggregate Intrinsic Value Outstanding	$ 1,655,880
Aggregate Intrinsic Value Exercisable	$ 1,655,880
Price Range One [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Price - Lower Range	$ 11.27
Range of Exercise Price - Upper Range	$ 14.08
Number of Options Outstanding	118,894
Weighted Average Exercise Price outstanding	$ 11.83
Weighted Average Contractual Life Remaining	1 year
Number of Options Exercisable	118,894
Weighted Average Exercise Price	$ 11.83
Price Range Two [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Price - Lower Range	14.09
Range of Exercise Price - Upper Range	$ 16.90
Number of Options Outstanding	224,700
Weighted Average Exercise Price outstanding	$ 15.40
Weighted Average Contractual Life Remaining	2 years 8 months 12 days
Number of Options Exercisable	224,700
Weighted Average Exercise Price	$ 15.40
Price Range Three [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Price - Lower Range	16.91
Range of Exercise Price - Upper Range	$ 19.71
Number of Options Outstanding	137,850
Weighted Average Exercise Price outstanding	$ 17.44
Weighted Average Contractual Life Remaining	4 years 2 months 12 days
Number of Options Exercisable	137,850
Weighted Average Exercise Price	$ 17.44

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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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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 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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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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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