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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
NET INCOME $ 298,209 $ 213,521 $ 71,100
Postretirement benefit plans:      
Net actuarial gain, net of tax of: (2022 - $1,144; 2021 - $451; 2020 - $513) 3,298 1,300 1,480
Pension settlement expense, net of tax of: (2020 - $23)     66
Amortization of unrecognized net periodic benefit credit, net of tax of: (2022 - $195; 2021 - $139; 2020 - $152)      
Net actuarial gain (562) (400) (437)
Prior service credit     (1)
Interest rate swap and foreign currency translation:      
Change in unrealized income (loss) on interest rate swap, net of tax of: (2022 - $812; 2021 - $534; 2020 - $277) 2,295 1,507 (782)
Change in foreign currency translation, net of tax of: (2022 - $576; 2021 - $36; 2020 - $232) (1,627) 102 661
OTHER COMPREHENSIVE INCOME, net of tax 3,404 2,509 987
TOTAL COMPREHENSIVE INCOME $ 301,613 $ 216,030 $ 72,087