Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 695,087	$ 682,798	$ 706,871
Other comprehensive income, net of tax	49,165	5,592	16,470
Ending balance	814,343	695,087	682,798
Tax effects of foreign translation adjustment	0	0	0
U.S. | Pension
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pension settlement gain (loss), reclassification adjustment before tax	(6,000)
Canada
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pension settlement gain (loss), reclassification adjustment before tax		3,000
Canada | Pension
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pension settlement gain (loss), reclassification adjustment before tax	(2,000)		(9,000)
Unrecognized components of employee benefit plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(146,614)	(126,638)	(135,590)
Other comprehensive gain (loss) before reclassifications	63,147	(37,515)	(8,119)
Income tax on other comprehensive gain (loss)	(13,365)	8,940	2,413
Income tax on reclassifications	(6,649)	(2,255)	(4,711)
Other comprehensive income, net of tax	69,765	(19,976)	8,952
Ending balance	(76,849)	(146,614)	(126,638)
Pension settlement loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassifications to earnings	7,618	(2,548)	8,787
Amortization of losses
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassifications to earnings	15,491	12,838	9,889
Amortization of prior service costs
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassifications to earnings	550	564	693
Plans included in sale of assets to GreenFirst
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassifications to earnings	(4,012)	0	0
Income tax on reclassifications	1,039	0	0
Unrealized gain on derivative instruments, net of tax
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,834	1,290	(11,622)
Other comprehensive gain (loss) before reclassifications	0	(8,788)	12,822
Income tax on other comprehensive gain (loss)	0	2,171	(3,076)
Income tax on reclassifications	1,010	(2,202)	(1,761)
Other comprehensive income, net of tax	(2,681)	544	12,912
Ending balance	(847)	1,834	1,290
Foreign currency translation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	11,145	(13,879)	(8,485)
Other comprehensive income, net of tax	(17,919)	25,024	(5,394)
Ending balance	(6,774)	11,145	(13,879)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(133,635)	(139,227)	(155,697)
Other comprehensive income, net of tax	49,165	5,592	16,470
Ending balance	(84,470)	(133,635)	(139,227)
Interest rate swaps | Unrealized gain on derivative instruments, net of tax
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassifications to earnings	0	2,666	(688)
Foreign exchange contracts | Unrealized gain on derivative instruments, net of tax
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassifications to earnings	$ (3,691)	$ 6,697	$ 5,615