Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income				$ 284,102	$ 319,011
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization		$ 20,379	$ 17,432	40,253	35,831
Basis of real estate sold		7,325	7,213	18,179	16,036
Change in deferred taxes				(2,089)	562
Pension and other postretirement employee benefits				7,397	11,111
Pension settlement charge				14,165	0
Equity-based compensation expense				4,424	4,070
Gain on fire damage		(9,868)	0	(9,592)	0
Other, net				(599)	(295)
Change in working capital and operating-related activities, net				19,972	(37,154)
Real estate development expenditures				(5,190)	(3,999)
Funding of pension and other postretirement employee benefits				(2,264)	(3,833)
Proceeds from insurance recoveries				9,428	0
Net cash from operating activities				378,186	341,340
CASH FLOWS FROM INVESTING ACTIVITIES
Property, plant and equipment additions				(36,777)	(15,943)
Timberlands reforestation and roads				(8,388)	(7,954)
Acquisition of timber and timberlands				(42,218)	(2,192)
Other, net				(1,383)	635
Net cash from investing activities				(88,766)	(25,454)
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to common stockholders				(61,048)	(54,973)
Repurchase of common stock				(4,156)	0
Repayments of long term debt				(3,000)	0
Other, net				(2,094)	(1,223)
Net cash from financing activities				(70,298)	(56,196)
Change in cash, cash equivalents and restricted cash				219,122	259,690
Cash, cash equivalents and restricted cash at beginning of period				296,772	252,340
Cash, cash equivalents and restricted cash at end of period		515,894	512,030	515,894	512,030
NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued property, plant and equipment additions				946	1,474
Accrued timberlands reforestation and roads				614	1,170
Cash and cash equivalents		511,157	512,030	511,157	512,030
Restricted cash included in other long-term assets	[1]	$ 4,737	$ 0	$ 4,737	$ 0
Restricted Cash, Asset, Statement of Financial Position [Extensible List]		us-gaap:OtherAssetsMember	us-gaap:OtherAssetsMember	us-gaap:OtherAssetsMember	us-gaap:OtherAssetsMember
Total cash, cash equivalents, and restricted cash		$ 515,894	$ 512,030	$ 515,894	$ 512,030

[1] 1 Amounts included in restricted cash represent proceeds held by a qualified intermediary that are intended to be reinvested in timber and timberlands.