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Accrued Liabilities
 12 Months Ended
Dec. 31, 2020
Accrued Liabilities [Abstract]  
Accrued Liabilities Accrued Liabilities
 
Accrued liabilities at December 31 consisted of:
20202019
Payroll and other compensation$26,834 $39,293 
Contract liabilities39,865 55,076 
Pension and other postretirement benefits6,318 8,044 
Accrued income taxes31,883 41,706 
Lease liability 11,707 10,751 
Business reorganizations (Note 10)13,151 — 
Other48,802 55,122 
$178,560 $209,992