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Employee Benefit Plans - Pre-tax amounts recognized in comprehensive loss (Details) - Retirement Income Plan - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gain) loss | $ (1,217,000) | $ 3,962,000 | $ 2,712,000
Amortization of net loss | (986,000) | (919,000) | (824,000)
Net transition obligation (asset) | 0 | 0 | 0
Settlement Loss | (4,660,000) |  |
Amount recognized in accumulated other comprehensive loss | $ 6,863,000 | $ 3,043,000 | $ 1,888,000

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