Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	CatchMark Merger [Member]	Common Stock [Member]	Common Stock [Member] CatchMark Merger [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] CatchMark Merger [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balance, beginning of period at Dec. 31, 2021	$ 1,526,133		$ 69,064		$ 1,781,217		$ (280,910)	$ (43,238)
Balance, beginning of period (shares) at Dec. 31, 2021			69,064,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	163,880						163,880
Shares issued for stock compensation			$ 308		(308)
Shares issued for stock compensation (shares)			308,000
Equity-based compensation expense	2,056				2,056
Pension plans and OPEB obligations, net of tax	7,480							7,480
Cash flow hedges, net of tax	43,276							43,276
Dividends on common stock	(30,524)						(30,524)
Other transactions, net	(103)				(25)		(78)
Balance, end of period at Mar. 31, 2022	1,712,198		$ 69,372		1,782,940		(147,632)	7,518
Balance, end of period (shares) at Mar. 31, 2022			69,372,000
Balance, beginning of period at Dec. 31, 2021	1,526,133		$ 69,064		1,781,217		(280,910)	(43,238)
Balance, beginning of period (shares) at Dec. 31, 2021			69,064,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	330,057
Cash flow hedges, net of tax	118,530
Balance, end of period at Sep. 30, 2022	2,405,419		$ 80,777		2,292,130		(52,089)	84,601
Balance, end of period (shares) at Sep. 30, 2022			80,777,000
Balance, beginning of period at Mar. 31, 2022	1,712,198		$ 69,372		1,782,940		(147,632)	7,518
Balance, beginning of period (shares) at Mar. 31, 2022			69,372,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	120,222						120,222
Shares issued for stock compensation			$ 3		(3)
Shares issued for stock compensation (shares)			3,000
Equity-based compensation expense	2,368				2,368
Repurchase of common stock	(4,156)		$ (95)				(4,061)
Repurchase of common stock (shares)			(95,000)
Pension plans and OPEB obligations, net of tax	915							915
Cash flow hedges, net of tax	42,529							42,529
Dividends on common stock	(30,524)						(30,524)
Other transactions, net	(1)				78		(79)
Balance, end of period at Jun. 30, 2022	1,843,551		$ 69,280		1,785,383		(62,074)	50,962
Balance, end of period (shares) at Jun. 30, 2022			69,280,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45,955						45,955
Shares issued for stock compensation			$ 31		(31)
Shares issued for stock compensation (shares)			31,000
Equity-based compensation expense	2,409				2,409
Repurchase of common stock	(371)		$ (8)				(363)
Repurchase of common stock (shares)			(8,000)
Pension plans and OPEB obligations, net of tax	914							914
Cash flow hedges, net of tax	32,725							32,725
Dividends on common stock	(35,530)						(35,530)
Common stock issued for CatchMark merger		$ 515,766		$ 11,474		$ 504,292
Common stock issued for CatchMark merger (Shares)				11,474,000
Other transactions, net					77		(77)
Balance, end of period at Sep. 30, 2022	2,405,419		$ 80,777		2,292,130		(52,089)	84,601
Balance, end of period (shares) at Sep. 30, 2022			80,777,000
Balance, beginning of period at Dec. 31, 2022	$ 2,263,153		$ 79,683		2,294,797		(208,979)	97,652
Balance, beginning of period (shares) at Dec. 31, 2022	79,683,000		79,683,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 16,260						16,260
Shares issued for stock compensation			$ 233		(233)
Shares issued for stock compensation (shares)			233,000
Equity-based compensation expense	2,279				2,279
Pension plans and OPEB obligations, net of tax	(131)							(131)
Cash flow hedges, net of tax	(17,335)							(17,335)
Dividends on common stock	(35,962)						(35,962)
Other transactions, net	(1)				84		(85)
Balance, end of period at Mar. 31, 2023	2,228,263		$ 79,916		2,296,927		(228,766)	80,186
Balance, end of period (shares) at Mar. 31, 2023			79,916,000
Balance, beginning of period at Dec. 31, 2022	$ 2,263,153		$ 79,683		2,294,797		(208,979)	97,652
Balance, beginning of period (shares) at Dec. 31, 2022	79,683,000		79,683,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 62,241
Cash flow hedges, net of tax	28,848
Balance, end of period at Sep. 30, 2023	$ 2,239,097		$ 79,628		2,301,301		(267,725)	125,893
Balance, end of period (shares) at Sep. 30, 2023	79,628,000		79,628,000
Balance, beginning of period at Mar. 31, 2023	$ 2,228,263		$ 79,916		2,296,927		(228,766)	80,186
Balance, beginning of period (shares) at Mar. 31, 2023			79,916,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,306						22,306
Shares issued for stock compensation			$ 4		(4)
Shares issued for stock compensation (shares)			4,000
Equity-based compensation expense	1,577				1,577
Repurchase of common stock	(394)		$ (9)				(385)
Repurchase of common stock (shares)			(9,000)
Pension plans and OPEB obligations, net of tax	(344)							(344)
Cash flow hedges, net of tax	17,719							17,719
Dividends on common stock	(35,958)						(35,958)
Other transactions, net					93		(93)
Balance, end of period at Jun. 30, 2023	2,233,169		$ 79,911		2,298,593		(242,896)	97,561
Balance, end of period (shares) at Jun. 30, 2023			79,911,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,675						23,675
Equity-based compensation expense	2,616				2,616
Repurchase of common stock	(12,735)		$ (283)				(12,452)
Repurchase of common stock (shares)			(283,000)
Pension plans and OPEB obligations, net of tax	(132)							(132)
Cash flow hedges, net of tax	28,464							28,464
Dividends on common stock	(35,960)						(35,960)
Other transactions, net					92		(92)
Balance, end of period at Sep. 30, 2023	$ 2,239,097		$ 79,628		$ 2,301,301		$ (267,725)	$ 125,893
Balance, end of period (shares) at Sep. 30, 2023	79,628,000		79,628,000