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Employee Benefit Plans - Components of Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost   $ 18,467 $ 17,579 $ 28,561
Allocated to discontinued operations   (522) (447) (789)
Net periodic benefit cost - continuing operations   17,945 17,132 27,772
Defined benefit plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Interest cost   19,799 23,287 23,836
Expected return on plan assets, net of expenses   (21,016) (19,974) (22,232)
Amortization of actuarial loss and prior service cost   4,672 2,622 3,527
Settlement losses $ 11,700 0 0 11,713
Total for defined benefit plans   3,455 5,935 16,844
Multi-employer plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost   5 132 190
SERPs        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Interest cost   586 718  
Settlement losses       1,800
Net periodic benefit cost   933 1,018 2,908
Defined Contribution Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost   $ 14,074 $ 10,494 $ 8,619