Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 55,661	$ 122,880	$ 86,453
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	72,105	73,161	29,912
Basis of real estate sold	20,554	16,698	6,827
Gain on sale of facility	(9,176)
Loss on extinguishment of debt	5,512
Change in deferred taxes	(11,045)	12,161	15,364
Pension and other postretirement employee benefits	11,877	16,443	13,151
Equity-based compensation expense	7,272	8,206	5,379
Other, net	(2,324)	(1,221)	(2,529)
Change in working capital, net of business acquired:
Receivables, net	7,238	2,822	3,602
Inventories, net	(3,519)	273	2,490
Other assets	5,305	(3,996)	(15)
Accounts payable and accrued liabilities	(11,415)	(5,212)	11,591
Other liabilities	3,955	(692)	1,072
Real estate development expenditures	(7,254)	(5,049)	0
Funding of pension and other postretirement employee benefits	(5,678)	(57,580)	(10,638)
Net cash provided by operating activities	139,068	178,894	162,659
CASH FLOWS FROM INVESTING ACTIVITIES
Property, plant and equipment additions	(39,153)	(29,880)	(12,855)
Timberlands reforestation and roads	(17,695)	(17,378)	(15,207)
Acquisition of timber and timberlands	(626)	(4,877)	(22,043)
Proceeds on disposition of property, plant and equipment	2,389	45	94
Proceeds on sale of facility	58,793
Cash and cash equivalents acquired in Deltic merger		3,419
Transfer from company owned life insurance (COLI)	1,968	1,796	1,278
Transfer to COLI	(1,148)	(1,027)	(1,324)
Other, net	(11)	(7)	37
Net cash provided by (used in) investing activities	4,517	(47,909)	(50,020)
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to common stockholders	(107,722)	(146,768)	(61,931)
Repurchase of common stock	(25,173)
Proceeds from Potlatch revolving line of credit		100,000
Repayment of revolving line of credit		(100,000)
Proceeds from issue of long-term debt	190,000	100,000
Repayment of long-term debt	(190,000)	(14,250)	(11,000)
Premiums and fees on debt retirement	(4,865)
Other, net	(1,012)	(4,983)	(1,835)
Net cash used in financing activities	(138,772)	(172,001)	(74,766)
Change in cash, cash equivalents and restricted cash	4,813	(41,016)	37,873
Cash, cash equivalents and restricted cash at beginning of period	79,441	120,457	82,584
Cash, cash equivalents and restricted cash at end of period	84,254	79,441	120,457
NONCASH INVESTING AND FINANCING ACTIVITIES
Long-term debt assumed by buyer in sale of facility	29,000
Accrued property, plant and equipment additions	1,396	339	127
Accrued timberlands reforestation and roads	352	199	576
Earnings and profits distribution		177,565
Cash paid during the year for:
Interest, net of amounts capitalized	32,282	34,490	26,125
Income taxes, net	$ 7,148	10,800	$ 15,845
Deltic [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of revolving line of credit		(106,000)
NONCASH INVESTING AND FINANCING ACTIVITIES
Equity issued as consideration for our merger with Deltic		$ 1,142,775