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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 |  |  |

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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