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Employee Benefit Plans - Components of expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Net periodic benefit cost $ 12,644 $ 14,737 $ 18,467
Allocated to discontinued operations 0 0 (522)
Net periodic benefit cost - continuing operations 12,644 14,737 17,945
Defined benefit plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Interest cost 17,332 16,465 19,799
Expected return on plan assets, net of expenses (24,900) (23,235) (21,016)
Amortization of actuarial loss and prior service cost 4,034 6,210 4,672
Total for defined benefit plans (3,534) (560) 3,455
Multi-employer plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Net periodic benefit cost 0 0 5
SERPs      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Interest cost 509 473  
Net periodic benefit cost 921 903 933
Defined Contribution Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Net periodic benefit cost $ 15,257 $ 14,394 $ 14,074