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Employee Benefit Plans - Components of Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 3,695 $ 4,780 $ 7,666 $ 9,594
Net periodic benefit cost — continuing operations        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 3,695 4,659 7,666 9,268
Disposed of by sale | Allocated to discontinued operations        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 0 (121) 0 (326)
Defined contribution plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 3,702 3,702 7,680 7,481
Defined benefit plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Interest cost 4,103 4,918 8,206 9,835
Expected return on plan assets, net of expenses (5,820) (5,256) (11,640) (10,512)
Amortization of actuarial loss and prior service cost 1,486 1,124 2,973 2,249
Total for defined benefit pension plan (231) 786 (461) 1,572
Multi-employer plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 0 52 0 61
SERPs        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 224 $ 240 $ 447 $ 480