CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 71,283	$ 69,569
Amortization of unrecognized net periodic benefit credit, net of tax of: (2023 - $86; 2022 - $48)
Net actuarial gain	(247)	(141)
Interest rate swap and foreign currency translation:
Change in unrealized income (loss) on interest rate swap, net of tax of: (2023 - $161; 2022 - $517)	(452)	1,458
Change in foreign currency translation, net of tax of: (2023 - $6; 2022 - $108)	(18)	307
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(717)	1,624
TOTAL COMPREHENSIVE INCOME	$ 70,566	$ 71,193