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Employee Benefit Plans - Components of Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 3,461 $ 4,336 $ 11,127 $ 13,930
Net periodic benefit cost — continuing operations        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 3,461 4,165 11,127 13,433
Disposed of by sale | Allocated to discontinued operations        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 0 (171) 0 (497)
Defined contribution plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 3,197 3,060 10,877 10,541
Defined benefit plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Interest cost 4,143 5,014 12,349 14,849
Expected return on plan assets, net of expenses (5,786) (5,250) (17,426) (15,762)
Amortization of actuarial loss and prior service cost 1,684 1,255 4,657 3,504
Total for defined benefit pension plan 41 1,019 (420) 2,591
Multi-employer plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 0 15 0 76
SERPs        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 223 $ 242 $ 670 $ 722