Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	CatchMark Merger [Member]	Loutre Merger [Member]	Common Stock [Member]	Common Stock [Member] CatchMark Merger [Member]	Common Stock [Member] Loutre Merger [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] CatchMark Merger [Member]	Additional Paid-in Capital [Member] Loutre Merger [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, beginning of period at Dec. 31, 2019	$ 1,226,831			$ 67,221			$ 1,666,299			$ (359,330)	$ (147,359)
Balance, beginning of period (shares) at Dec. 31, 2019				67,221
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	166,830									166,830
Equity-based compensation expense	8,063						8,063
Shares issued for stock compensation				$ 144			(144)
Shares issued for stock compensation (shares)				144
Repurchase of common stock	(15,364)			$ (489)						(14,875)
Repurchase of common stock (shares)				(489)
Pension plans and OPEB obligations, net of tax	33,551										33,551
Cash flow hedges, net of tax	(7,181)										(7,181)
Common dividends	(107,853)									(107,853)
Other transactions, net	76						358			(282)
Balance, end of period at Dec. 31, 2020	1,304,953			$ 66,876			1,674,576			(315,510)	(120,989)
Balance, end of period (shares) at Dec. 31, 2020				66,876
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	423,860									423,860
Equity-based compensation expense	8,607						8,607
Shares issued for stock compensation				$ 226			(226)
Shares issued for stock compensation (shares)				226
Common stock issued			$ 100,930			$ 1,962			$ 98,968
Common stock issued (shares)						1,962
Pension plans and OPEB obligations, net of tax	42,439										42,439
Cash flow hedges, net of tax	35,312										35,312
Common dividends	(388,241)									(388,241)
Other transactions, net	(1,727)						(708)			(1,019)
Balance, end of period at Dec. 31, 2021	1,526,133			$ 69,064			1,781,217			(280,910)	(43,238)
Balance, end of period (shares) at Dec. 31, 2021				69,064
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	333,900									333,900
Equity-based compensation expense	9,190						9,190
Shares issued for stock compensation				$ 344			(344)
Shares issued for stock compensation (shares)				344
Repurchase of common stock	(54,549)			$ (1,199)						(53,350)
Repurchase of common stock (shares)				(1,199)
Common stock issued		$ 515,766			$ 11,474			$ 504,292
Common stock issued (shares)					11,474
Pension plans and OPEB obligations, net of tax	22,875										22,875
Cash flow hedges, net of tax	118,015										118,015
Common dividends	(208,133)									(208,133)
Other transactions, net	(44)						442			(486)
Balance, end of period at Dec. 31, 2022	$ 2,263,153			$ 79,683			$ 2,294,797			$ (208,979)	$ 97,652
Balance, end of period (shares) at Dec. 31, 2022				79,683