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Accrued Liabilities
 12 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued Liabilities
Other current liabilities consisted of the following at December 31:
(in thousands)20212020
Payroll and incentive compensation$46,485 $30,145 
Union dues and benefits19,994 17,800 
Taxes4,605 18,130 
Profit sharing and thrift plan11,175 10,763 
Other12,598 9,880 
$94,857 $86,718