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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
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