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Retirement and Postretirement Plans - Summary of Components of Net Periodic Benefit Cost (Credit) for Plans (Details) - USD ($)
$ in Thousands
11 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Settlement gain recognized $ (1,200)  
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 14,981 $ 13,965
Expected return on plan assets (27,658) (25,534)
Settlement gain recognized (1,160)  
Net periodic benefit cost (credit) (13,837) (11,569)
OPEB [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 22 16
Interest cost 695 689
Amortization of net loss   109
Net periodic benefit cost (credit) $ 717 $ 814