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10-K Employee Benefit Plans - Defined contribution plans and multiemployer plans, narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Multiemployer Plan [Line Items]      
Multiemployer plan, contribution cost $ 5,611 $ 12,470 $ 12,770
Other postretirement benefits      
Multiemployer Plan [Line Items]      
Multiemployer plan, contribution cost 1,800 3,200 3,400
Qualified plan      
Multiemployer Plan [Line Items]      
Defined contribution plan, contribution cost $ 27,600 $ 26,600 $ 28,000