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Deferred Compensation Plan (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 11, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Compensation Plan [Abstract] |  |  |  |
Percentage of participant's base salary contributed |  | 10.00% |  |
Percentage of Company contributions that vest after ten years of service |  | 50.00% |  |
Number of years of service to qualify for 50% vesting in Company contributions |  | 10 years |  |
Percentage of Company contributions that vest annually thereafter |  | 5.00% |  |
Minimum age for participant's unvested company contributions to fully vest |  | 60 years |  |
Compensation expense |  | $ 2.3 | $ 1.8 | $ 1.1
Long-term deferred compensation liability |  | 47.5 | 43.2 |
Investment in Rabbi Trust |  | $ 45.5 | $ 41.7 |
Subsequent Event [Member] |  |  |  |
Deferred Compensation Plan [Abstract] |  |  |  |
Percentage of participant's base salary contributed | 5.00% |  |  |
Percentage of Company contributions that vest after five years of service | 20.00% |  |  |
Vesting period | 5 years |  |  |
Participant's vesting percentage | 100.00% |  |  |
Maximum [Member] |  |  |  |
Deferred Compensation Plan [Abstract] |  |  |  |
Percentage of participant's salary that can be deferred |  | 80.00% |  |
Percentage of participant's bonus or director fees that can be deferred |  | 100.00% |  |
Minimum [Member] | Subsequent Event [Member] |  |  |  |
Deferred Compensation Plan [Abstract] |  |  |  |
Number of years of service required for accelerated vesting above specified compensation level | 10 years |  |  |

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- Definition The minimum age for a participant's unvested company contributions to fully vest in a deferred compensation plan. + References No definition available. + Details
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- Definition The percentage of a participant's contributions that vest in a deferred compensation plan. + References No definition available. + Details
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- Definition The percentage of a participant's base salary that can be be deferred in a deferred compensation plan. + References No definition available. + Details
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- Definition The percentage of a participant's bonus or director fees that can be deferred in a deferred compensation plan. + References No definition available. + Details
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- Definition The percentage of company contributions to a deferred compensation plan that vest after five years of service. + References No definition available. + Details
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- Definition The percentage of company contributions to a deferred compensation plan that vest after ten years of service. + References No definition available. + Details
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- Definition The percentage of company contributions to a deferred compensation plan that vest annually after the first 50% vest with ten years of service. + References No definition available. + Details
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- Definition The term of a participant's service with the Company to qualify for accelerated vesting above a specified compensation level under the deferred compensation plan. + References No definition available. + Details
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- Definition The term of a participant's service with the Company to qualify for 50% vesting of Company contributions to a deferred compensation plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period over which participant vests in Company contributions to deferred compensation plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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