CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net Income (Loss)	$ 46,924	$ 40,443	$ 44,612	$ 111,726
Amortization of unrecognized net periodic benefit credit, net of tax: (2024 - Three-month period $64, Six-month period $129) (2023 - Three-month period $85, Six-month period $171)
Net actuarial gain	(185)	(247)	(372)	(494)
Interest rate swap and foreign currency translation:
Change in unrealized income (loss) on interest rate swap, net of tax: (2024 - Three-month period $152, Six-month period $282) (2023 - Three-month period $11, Six-month period $150)	(432)	31	(798)	(421)
Change in foreign currency translation, net of tax: (2024 - Three-month period $90, Six-month period $240) (2023 - Three-month period $141, Six-month period $135)	(255)	399	(681)	381
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(872)	183	(1,851)	(534)
TOTAL COMPREHENSIVE INCOME	$ 46,052	$ 40,626	$ 42,761	$ 111,192