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Employee Benefit Plans - Pre-tax amounts recognized in comprehensive loss (Details) - Retirement Income Plan - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss $ 3,962,000 $ 2,712,000 $ (799,000)
Amortization of net loss (919,000) (824,000) (851,000)
Net transition obligation (asset) 0 0 0
Amount recognized in accumulated other comprehensive loss $ 3,043,000 $ 1,888,000 $ (1,650,000)