Pension and Other Post-Retirement Benefit Obligations (Tables)

3 Months Ended

Mar. 31, 2023

Compensation And Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

The components of the net benefit costs for the Celgar and Peace River defined benefit plans, in aggregate for the three month periods ended March 31, 2023 and 2022 were as follows:

	Three Months Ended March 31,
	2023						2022
	Pension			Other Post- Retirement Benefits			Pension			Other Post- Retirement Benefits
Service cost	$	598		$	29		$	913		$	49
Interest cost		1,166			123			965			105
Expected return on plan assets		(1,357	)		—			(1,478	)		—
Amortization of unrecognized items		128			(241	)		62			(178	)
Net benefit costs (gains)	$	535		$	(89	)	$	462		$	(24	)