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Executive Deferred Compensation Plan (Details) - Executive [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Executive Deferred Compensation Plan [Abstract] |  |  |
Percentage of matching contribution maximum | 10.00% |  |
Percentage of compensation deferred, maximum | 80.00% |  |
Percentage of bonus deferred, maximum | 100.00% |  |
Percentage vested after ten years of service | 50.00% |  |
Number of years of service to attain fifty percent vesting | 10 years |  |
Percentage vested per year after ten years of service | 5.00% |  |
Minimum age for unvested company contributions to fully vest | 60 years |  |
Compensation expense | $ 1.8 | $ 1.1 | $ 1.5
Long-term deferred compensation liability | 43.2 | 36.4 |
Investment in Rabbi Trust | $ 41.7 | $ 35.6 |

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- Definition The number of years of service with the company to attain fifty percent vesting. + References No definition available. + Details
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- Definition The maximum percentage of bonus pay that the participant is allowed to defer. + References No definition available. + Details
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- Definition This element represent the percentage vested per year after ten full years of service. + 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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