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Qualified Employee Benefit Plans - Amounts Included in Accumulated Other Comprehensive Income (Loss) (Details) - Retirement Plan - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Unrecognized net loss from experience different from that assumed and effects of changes and assumptions $ (55,537) $ (47,603)
Prior service cost (731) (755)
Pension and other postretirement benefit plans, accumulated other comprehensive loss, before tax (56,268) (48,358)
Income tax benefit 513 201
Accumulated other comprehensive loss $ (55,755) $ (48,157)