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Pension Benefits - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Period of service to become eligible | 6 months |
Quantifying Misstatement in Current Year Financial Statements, Amount |  | $ 269,000,000
Defined Benefit Plan, Accumulated Benefit Obligation | $ 2,900,000 | 1,700,000
Unrecorded Pension Expense [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount |  | 269,000
Subsidiaries [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension expense | $ 300,000 | $ 700,000

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