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Employee Benefit Plans - Components of expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Net periodic benefit cost $ 14,737 $ 18,467 $ 17,579
Allocated to discontinued operations 0 (522) (447)
Net periodic benefit cost - continuing operations 14,737 17,945 17,132
Defined benefit plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Interest cost 16,465 19,799 23,287
Expected return on plan assets, net of expenses (23,235) (21,016) (19,974)
Amortization of actuarial loss and prior service cost 6,210 4,672 2,622
Total for defined benefit plans (560) 3,455 5,935
Multi-employer plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Net periodic benefit cost 0 5 132
SERPs      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Interest cost 473 586  
Net periodic benefit cost 903 933 1,018
Defined Contribution Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Net periodic benefit cost $ 14,394 $ 14,074 $ 10,494