Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenues		$ 306,693	$ 287,330	$ 1,077,640	$ 1,089,029
Costs and expenses:
Cost of goods sold		220,876	190,602	592,057	537,683
Selling, general and administrative expenses		18,878	18,512	55,584	54,782
CatchMark merger-related expenses		26,007	0	26,007	0
Gain on fire damage		(24,913)	(4,394)	(34,505)	(4,394)
Total costs and expenses		240,848	204,720	639,143	588,071
Operating income		65,845	82,610	438,497	500,958
Interest expense, net	[1]	(8,280)	(8,641)	(18,593)	(20,414)
Pension settlement charge		0	0	(14,165)	0
Non-operating pension and other postretirement employee benefit costs		(1,808)	(3,271)	(5,546)	(9,956)
Other		(1)	0	(1)	0
Income before income taxes		55,756	70,698	400,192	470,588
Income taxes		(9,801)	(5,031)	(70,135)	(85,910)
Net income		$ 45,955	$ 65,667	$ 330,057	$ 384,678
Net income per share:
Basic		$ 0.64	$ 0.98	$ 4.70	$ 5.72
Diluted		0.64	0.97	4.69	5.69
Dividends per share		$ 0.44	$ 0.41	$ 1.32	$ 1.23
Weighted-average shares outstanding
Basic		71,486	67,315	70,171	67,275
Diluted		71,632	67,648	70,308	67,588

[1] Bond discounts and deferred loan fees are reported within interest expense, net on the Condensed Consolidated Statements of Operations.