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Benefit Plans - Salary Continuation Plan (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |
Percentage of salary paid upon retirement | 25.00% |
Period before ratable vesting begins | 5 years |
Age ratable vesting ends | 65 years |
Liability under the Salary Continuation Plan | $ 2.7 | $ 2.5

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