INTERIM CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Cash flows from (used in) operating activities
Net loss	$ (67,586)	$ (98,306)	$ (84,289)	$ (128,884)
Adjustments to reconcile net loss to cash flows from operating activities
Depreciation and amortization	39,941	40,152	80,345	87,743
Deferred income tax provision (recovery)	7,322	(34,105)	(6,104)	(44,049)
Inventory impairment	0	51,400	0	66,600
Loss on disposal of investment in joint venture	0	0	23,645	0
Goodwill impairment	34,277	0	34,277	0
Defined benefit pension plans and other post-retirement benefit plan expense	431	451	641	897
Stock compensation expense	1,403	1,387	3,432	2,613
Foreign exchange transaction losses (gains)	(3,382)	224	(6,831)	494
Other	1,389	(5,452)	2,116	(6,601)
Defined benefit pension plans and other post-retirement benefit plan contributions	(288)	(1,318)	(617)	(1,565)
Changes in working capital
Accounts receivable	21,929	12,168	(41,800)	23,510
Inventories	4,506	58,880	4,595	(27,554)
Accounts payable and accrued expenses	15,718	(7,490)	18,108	(7,181)
Other	6,525	(3,293)	5,473	(975)
Net cash from (used in) operating activities	62,185	14,698	32,991	(34,952)
Cash flows from (used in) investing activities
Purchase of property, plant and equipment	(17,883)	(39,482)	(36,344)	(72,911)
Acquisition, net of cash acquired	0	(82,100)	0	(82,100)
Property insurance proceeds	0	2,710	0	2,710
Proceeds from government grants	0	0	787	0
Other	(2,271)	1,120	(2,081)	1,925
Net cash from (used in) investing activities	(20,154)	(117,752)	(37,638)	(150,376)
Cash flows from (used in) financing activities
Proceeds from (repayment of) revolving credit facilities, net	(44,965)	24,305	(35,840)	54,407
Dividend payments	(5,014)	(4,982)	(5,014)	(4,982)
Payment of finance lease obligations	(2,687)	(1,898)	(4,876)	(3,787)
Other	(614)	(115)	(729)	(229)
Net cash from (used in) financing activities	(53,280)	17,310	(46,459)	45,409
Effect of exchange rate changes on cash and cash equivalents	150	(1,478)	287	(775)
Net decrease in cash and cash equivalents	(11,099)	(87,222)	(50,819)	(140,694)
Cash and cash equivalents, beginning of period	274,272	300,560	313,992	354,032
Cash and cash equivalents, end of period	263,173	213,338	263,173	213,338
Supplemental cash flow disclosure:
Cash paid for interest	16,813	3,621	51,529	36,861
Cash paid for income taxes	4,522	1,461	12,695	3,234
Supplemental schedule of non-cash investing and financing activities:
Leased production and other equipment	$ 4,131	$ 1,089	$ 8,645	$ 1,131