Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenues		$ 265,509	$ 306,693	$ 769,572	$ 1,077,640
Costs and expenses:
Cost of goods sold		226,303	220,876	665,716	592,057
Selling, general and administrative expenses		19,303	18,878	55,118	55,584
CatchMark merger-related expenses		0	26,007	2,453	26,007
Gain on fire damage		(16,326)	(24,913)	(39,436)	(34,505)
Total costs and expenses		229,280	240,848	683,851	639,143
Operating income		36,229	65,845	85,721	438,497
Interest expense, net	[1]	(7,971)	(8,280)	(15,783)	(18,593)
Pension settlement charge		0	0	0	(14,165)
Non-operating pension and other postretirement employee benefit costs		(228)	(1,808)	(685)	(5,546)
Other		370	(1)	638	(1)
Income before income taxes		28,400	55,756	69,891	400,192
Income taxes		(4,725)	(9,801)	(7,650)	(70,135)
Net income		$ 23,675	$ 45,955	$ 62,241	$ 330,057
Net income per share:
Basic		$ 0.3	$ 0.64	$ 0.78	$ 4.7
Diluted		0.29	0.64	0.78	4.69
Dividends per share		$ 0.45	$ 0.44	$ 1.35	$ 1.32
Weighted-average shares outstanding
Basic		80,132	71,486	80,102	70,171
Diluted		80,379	71,632	80,279	70,308

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