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Employee Benefit Plans - Components of Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Net periodic benefit cost $ 3,971 $ 4,814
Net periodic benefit cost — continuing operations    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Net periodic benefit cost 3,971 4,609
Disposed of by sale | Allocated to discontinued operations    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Net periodic benefit cost 0 (205)
Defined contribution plan    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Net periodic benefit cost 3,978 3,779
Defined benefit plans    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Interest cost 4,103 4,917
Expected return on plan assets, net of expenses (5,820) (5,256)
Amortization of actuarial loss and prior service cost 1,487 1,125
Total for defined benefit pension plan (230) 786
Multi-employer plans    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Net periodic benefit cost 0 9
SERPs    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Net periodic benefit cost $ 223 $ 240