PotlatchDeltic (PCH) 10-K 18 Feb 21 2020 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 12, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Registrant Name	POTLATCHDELTIC CORPORATION
Entity Central Index Key	0001338749
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		66,919,188
Entity Public Float			$ 2,465
Entity Shell Company	false
Entity File Number	1-32729
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-0156045
Entity Address, Address Line One	601 West 1st Ave
Entity Address, Address Line Two	Suite 1600
Entity Address, City or Town	Spokane
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	99201
City Area Code	(509)
Local Phone Number	835-1500
Document Annual Report	true
Document Transition Report	false
ICFR Auditor Attestation Flag	true
Title of each class	Common Stock ($1 par value)
Trading symbol(s)	PCH
Name of each exchange on which registered	NASDAQ
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive proxy statement for the 2021 annual meeting of stockholders expected to be filed with the Commission on or about March 30, 2021 are incorporated by reference in Part III hereof.

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues		$ 1,040,930	$ 827,098	$ 974,579
Costs and expenses:
Cost of goods sold		687,781	682,066	707,645
Selling, general and administrative expenses		72,519	57,925	59,861
Gain on sale of facility			(9,176)
Deltic merger-related costs	[1]			22,119
Total costs and expenses		760,300	730,815	789,625
Operating income		280,630	96,283	184,954
Interest expense, net	[2]	(29,463)	(30,361)	(35,227)
Loss on extinguishment of debt			(5,512)
Pension settlement charge		(42,988)
Non-operating pension and other postretirement employee benefit costs		(14,226)	(3,739)	(7,648)
Income before income taxes		193,953	56,671	142,079
Income taxes		(27,123)	(1,010)	(19,199)
Net income		$ 166,830	$ 55,661	$ 122,880
Net income per share:
Basic (in dollars per share)		$ 2.48	$ 0.82	$ 2.03
Diluted (in dollars per share)		2.47	0.82	1.99
Dividends/Special distribution per share		$ 1.61	$ 1.60	$ 1.60
Weighted-average shares outstanding (in thousands)
Basic (in shares)		67,237	67,608	60,534
Diluted (in shares)		67,568	67,743	61,814
Deltic [Member]
Costs and expenses:
Deltic merger-related costs				$ 22,100
Net income per share:
Dividends/Special distribution per share				$ 3.54
[1]	See Note 2: Mergers and Divestitures.
[2]	Includes amortization of bond discounts and deferred loan fees.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 166,830	$ 55,661	$ 122,880
Other comprehensive (loss) income, net of tax:
Net loss arising during the period, net of tax benefit of $3,531, $1,348 and $5,521	(10,053)	(3,836)	(15,714)
Effect of pension settlement, net of tax benefit of $11,177	31,811
Amortization of actuarial loss included in net income, net of tax expense of $4,445, $3,772 and $4,654	12,653	10,737	13,246
Amortization of prior service credit included in net income, net of tax benefit of $(303), $(2,244) and $(2,259)	(860)	(6,389)	(6,432)
Cash flow hedges, net of tax expense (benefit) of $396, $(978) and $(119)	(7,181)	(18,440)	(2,415)
Other comprehensive income (loss), net of tax	26,370	(17,928)	(11,315)
Comprehensive income	$ 193,200	$ 37,733	$ 111,565

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss arising during the period, tax benefit	$ 3,531	$ 1,348	$ 5,521
Effect of pension settlement, tax benefit	11,177
Amortization of prior service credit included in net income, tax benefit	(303)	(2,244)	(2,259)
Amortization of actuarial loss included in net income, tax expense	4,445	3,772	4,654
Cash flow hedge, tax expense (benefit)	$ 396	$ (978)	$ (119)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 252,340	$ 83,310
Customer receivables, net	26,606	14,167
Inventories, net	62,036	65,781
Other current assets	16,136	20,183
Total current assets	357,118	183,441
Property, plant and equipment, net	288,544	286,383
Investment in real estate held for development and sale	72,355	74,233
Timber and timberlands, net	1,600,061	1,638,663
Intangible assets, net	16,270	17,049
Other long-term assets	46,717	35,290
Total assets	2,381,065	2,235,059
Current liabilities:
Accounts payable and accrued liabilities	93,279	60,577
Current portion of long-term debt	39,981	45,974
Current portion of pension and other postretirement employee benefits	6,574	6,701
Total current liabilities	139,834	113,252
Long-term debt	717,366	710,495
Pension and other postretirement employee benefits	128,807	115,463
Deferred tax liabilities, net	17,740	20,165
Other long-term obligations	72,365	48,853
Total liabilities	1,076,112	1,008,228
Commitments and contingencies
Stockholders’ equity:
Preferred stock, authorized 4,000 shares, no shares issued
Common stock, $1 par value, authorized 100,000 shares, issued 66,876 and 67,221 shares	66,876	67,221
Additional paid-in capital	1,674,576	1,666,299
Accumulated deficit	(315,510)	(359,330)
Accumulated other comprehensive loss	(120,989)	(147,359)
Total stockholders’ equity	1,304,953	1,226,831
Total liabilities and stockholders' equity	$ 2,381,065	$ 2,235,059

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Preferred stock, authorized	4,000,000	4,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 1	$ 1
Common stock, authorized	100,000,000	100,000,000
Common stock, issued	66,876,000	67,221,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 166,830	$ 55,661	$ 122,880
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	77,885	72,105	73,161
Basis of real estate sold	25,348	20,554	16,698
Gain on sale of facility		(9,176)
Loss on extinguishment of debt		5,512
Change in deferred taxes	(14,610)	(11,045)	12,161
Pension and other postretirement employee benefits	23,666	11,877	16,443
Pension settlement charge	42,988
Equity-based compensation expense	8,063	7,272	8,206
Other, net	(1,269)	(2,324)	(1,221)
Change in working capital, net of business acquired:
Receivables, net	(12,439)	7,238	2,822
Inventories, net	3,745	(3,519)	273
Other assets	4,591	5,305	(3,996)
Accounts payable and accrued liabilities	25,848	(11,415)	(5,212)
Other liabilities	1,327	3,955	(692)
Real estate development expenditures	(6,706)	(7,254)	(5,049)
Funding of pension and other postretirement employee benefits	(10,004)	(5,678)	(57,580)
Net cash provided by operating activities	335,263	139,068	178,894
CASH FLOWS FROM INVESTING ACTIVITIES
Property, plant and equipment additions	(22,693)	(39,153)	(29,880)
Timberlands reforestation and roads	(16,234)	(17,695)	(17,378)
Acquisition of timber and timberlands	(6,858)	(626)	(4,877)
Proceeds on disposition of property, plant and equipment	370	2,389	45
Proceeds on sale of facility	1,000	58,793
Cash and cash equivalents acquired in Deltic merger			3,419
Transfer from company owned life insurance (COLI)	5,616	1,968	1,796
Transfer to COLI	(3,341)	(1,148)	(1,027)
Other, net	(52)	(11)	(7)
Net cash (used in) provided by investing activities	(42,192)	4,517	(47,909)
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to common stockholders	(107,853)	(107,722)	(146,768)
Repurchase of common stock	(15,364)	(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	46,000	190,000	100,000
Repayment of long-term debt	(46,000)	(190,000)	(14,250)
Premiums and fees on debt retirement		(4,865)
Other, net	(1,768)	(1,012)	(4,983)
Net cash used in financing activities	(124,985)	(138,772)	(172,001)
Change in cash, cash equivalents and restricted cash	168,086	4,813	(41,016)
Cash, cash equivalents and restricted cash at beginning of period	84,254	79,441	120,457
Cash, cash equivalents and restricted cash at end of period	$ 252,340	$ 84,254	79,441
Deltic [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of revolving line of credit			$ (106,000)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance, beginning of period at Dec. 31, 2017	$ 200,542	$ 40,612	$ 359,144	$ (104,363)	$ (94,851)
Balance, beginning of period (shares) at Dec. 31, 2017		40,612
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	122,880			122,880
Equity-based compensation expense	$ 8,206		8,206
Shares issued for stock compensation		$ 162	(162)
Shares issued for stock compensation (share)		162
Repurchase of common stock (shares)	0
Pension plans and OPEB obligations	$ (8,900)				(8,900)
Cash flow hedges	(2,415)				(2,415)
Cumulative effects of adoption of accounting standards	1,299			24,564	(23,265)
Common distributions, $1.60 per share 2018, $1.60 per share 2019, $1.61 per share 2020	(102,333)			(102,333)
Common stock issued for Deltic merger	1,142,775	$ 21,981	1,120,794
Common stock issued for Deltic merger (shares)		21,981
Deltic earnings and profit special distribution, $3.54 per share	(44,435)	$ 4,815	172,750	(222,000)
Deltic earnings and profit special distribution (shares)		4,815
Other transactions, net	(2,840)		(1,701)	(1,139)
Balance, end of period at Dec. 31, 2018	1,314,779	$ 67,570	1,659,031	(282,391)	(129,431)
Balance, end of period (shares) at Dec. 31, 2018		67,570
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	55,661			55,661
Equity-based compensation expense	7,272		7,272
Shares issued for stock compensation		$ 337	(337)
Shares issued for stock compensation (share)		337
Repurchase of common stock	$ (25,173)	$ (686)		(24,487)
Repurchase of common stock (shares)	(686,240)	(686)
Pension plans and OPEB obligations	$ 512				512
Cash flow hedges	(18,440)				(18,440)
Common distributions, $1.60 per share 2018, $1.60 per share 2019, $1.61 per share 2020	(107,722)			(107,722)
Other transactions, net	(58)		333	(391)
Balance, end of period at Dec. 31, 2019	1,226,831	$ 67,221	1,666,299	(359,330)	(147,359)
Balance, end 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 (share)		144
Repurchase of common stock	$ (15,364)	$ (489)		(14,875)
Repurchase of common stock (shares)	(489,850)	(489)
Pension plans and OPEB obligations	$ 33,551				33,551
Cash flow hedges	(7,181)				(7,181)
Common distributions, $1.60 per share 2018, $1.60 per share 2019, $1.61 per share 2020	(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

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common dividends, per share	$ 1.61	$ 1.60	$ 1.60
Deltic [Member] | Special Distribution [Member]
Common dividends, per share			$ 3.54

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES GENERAL PotlatchDeltic Corporation and its subsidiaries (collectively referred to in this report as the company, us, we or our) is a leading timberland Real Estate Investment Trust (REIT) with operations in seven states. We are engaged in activities associated with timberland management, including the sale of timber, the management of approximately 1.8 million acres of timberlands and the purchase and sale of timberlands. We are also engaged in the manufacture and sale of wood products and the development of real estate. Our timberlands, real estate development projects and all of our wood products facilities are located within the continental United States. The primary market for our products is the United States. We converted to a REIT effective January 1, 2006. As described in Note 2: Mergers and Divestitures CONSOLIDATION The Consolidated Financial Statements USE OF ESTIMATES The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, which we refer to in this report as GAAP, requires management to make estimates and judgments affecting the amounts reported in the financial statements and the accompanying notes. The inputs into our judgments and estimates consider the economic implications of COVID-19 on our critical and significant accounting estimates. The actual results that we experience may differ materially from our estimates. Cash, Cash Equivalents and Restricted Cash Cash equivalents are investments that are highly liquid with original maturities of three months or less when purchased. The following provides a reconciliation of cash, cash equivalents, and restricted cash at December 31: Years Ended December 31, (in thousands) 2020 2019 2018 Cash and cash equivalents $ 252,340 $ 83,310 $ 76,639 Restricted cash included in other long-term assets 1 — 944 2,802 Total cash, cash equivalents, and restricted cash $ 252,340 $ 84,254 $ 79,441 1 . The following present supplemental disclosures to the Consolidated Statements of Cash Flows Years Ended December 31, (in thousands) 2020 2019 2018 NONCASH INVESTING AND FINANCING ACTIVITIES Long-term debt assumed by buyer in sale of facility $ — $ 29,000 $ — Accrued property, plant and equipment additions $ 1,142 $ 1,396 $ 339 Accrued timberlands reforestation and roads $ 697 $ 352 $ 199 Equity issued as consideration for our merger with Deltic $ — $ — $ 1,142,775 Earnings and profits distribution $ — $ — $ 177,565 CASH FLOW INFORMATION Cash paid during the year for: Interest, net of amounts capitalized $ 28,518 $ 32,282 $ 34,490 Income taxes, net $ 25,790 $ 7,148 $ 10,800 BUSINESS COMBINATIONS We recognize identifiable assets acquired and liabilities assumed at their acquisition date estimated fair value. Goodwill, if any, as of the acquisition date is measured as the excess of consideration transferred over the net of the acquisition date estimated fair value of the assets acquired and the liabilities assumed. While we use our best estimates and assumptions for the purchase price allocation process to value assets acquired and liabilities assumed at the acquisition date, our estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, we record adjustments to the assets acquired and liabilities assumed to the extent that we identify adjustments to the preliminary purchase price allocation. We recognize measurement period adjustments and any resulting effect on earnings during the period in which the adjustment is identified. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to our Consolidated Statements of Operations REVENUE RECOGNITION We recognize revenue in accordance with the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic No. 606, Revenue from Contracts with Customers For our Timberlands segment we generate revenue predominantly in the form of delivered logs, pay-as-cut stumpage contracts, lump sum stumpage contracts and timber deeds. For our Wood Products segment we generate revenue from the sale of manufactured wood products and residual by-products. For our Real Estate segment, we generate revenue from the sale of rural real property deemed non-strategic or identified as having higher and better use alternatives and real estate development and subdivision activity. Performance Obligations A performance obligation, as defined in ASC 606, is a promise in a contract to transfer a distinct good or service to a customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue at the point in time, or over the period in which the performance obligation is satisfied. Performance obligations associated with delivered logs sales are typically recognized at the point the logs are delivered and scaled at our customers’ mills. Revenue is recognized on timber deeds and lump sum stumpage contracts generally upon closing or when the contracts are effective, which is the point at which the buyer assumes risk of loss associated with the standing timber. We enter into pay-as-cut contracts with customers that provide the customer with the right of access to harvest timber on a specified area of our land. At the execution of the agreement, the customer typically does not take title, control or risk of ownership to the timber. Revenue for pay-as-cut contracts is recognized once scaling occurs as that is the point when control of the harvested trees has transferred to the customer and we have a right to payment. Performance obligations associated with the sale of wood products are typically satisfied when the products are shipped (FOB shipping point) or upon delivery to our customer (FOB destination) depending on the terms of the customer contract. Shipping and handling costs for all wood products, log hauling costs and residual sales are accounted for as cost of goods sold in our Consolidated Statements of Operations . We also enter into vendor managed inventory (VMI) programs with certain customers whereby inventory is shipped to a VMI loc ation. For products shipped under VMI arrangements, revenue is recognized and billed when control transfers to the customer and we have no further obligations, which is generally once the customer pulls the inventory from the VMI warehouse. Performance obligations associated with real estate sales are generally satisfied at a point in time when all conditions of closing have been met and title transfers to the buyer. ASC 606 requires entities to consider significant financing components of contracts with customers, though allows for the use of a practical expedient when the period between satisfaction of a performance obligation and payment receipt is one year or less. Given the nature of our revenue transactions, we have elected to utilize this practical expedient. Contract Estimates There are no significant contract estimates as substantially all of our performance obligations are satisfied as of a point in time. The transaction price for log sales includes amounts billed for logging and hauling and generally equals the amount billed to our customer for logs delivered during the accounting period. For the limited number of log sales subject to a long-term supply agreement, the transaction price is variable but is known at the time of billing. For wood products sales, the transaction price is typically the amount billed to the customer for the products shipped but may be reduced slightly for estimated cash discounts and rebates. In general, a customer receivable is recorded as we deliver wood products, logs and residuals. We generally receive payment shortly after products have been received by our customers. For real estate sales we typically receive the entire consideration in cash at closing. At December 31, 2020 and 2019, the allowance for credit losses associated with our customer receivables was insignificant. See Note 3 Segment Information INVENTORIES For most of our operations, we use the last-in, first-out (LIFO) method of valuing log, lumber and plywood inventory. An actual valuation of inventory under the LIFO method occurs only at the end of each year based on the inventory levels and costs at that time. Interim LIFO calculations are based on management’s best estimates of expected year-end inventory levels and costs and are subject to the final year-end LIFO inventory valuation. Inventories valued under LIFO are stated at the lower of cost or market. All segment inventories are reported using the average cost method. The LIFO reserve and intersegment eliminations are recorded at the corporate level. Inventories not valued under LIFO are recorded at the lower of average cost or net realizable value. Expenses associated with idle capacity or abnormally low production are reflected in cost of goods sold in the periods incurred. See Note 5: Inventories PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are valued at cost less accumulated depreciation. Depreciation of buildings, equipment and other depreciable assets is determined using the straight-line method of depreciation. Major improvements and replacements of property are capitalized. Maintenance, repairs and minor improvements and replacements are expensed. Upon retirement or other disposition of property, applicable cost and accumulated depreciation are removed from the accounts. Any gains or losses are included in operating income. See Note 6: Property, Plant and Equipment RECOVERY OF LONG-LIVED ASSETS Our long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. We evaluate recoverability of an asset group by comparing its carrying value to the future net undiscounted cash flows that we expect will be generated by the asset group. If the comparison indicates that the carrying value of an asset group is not recoverable, we recognize an impairment loss for the excess of carrying value over the estimated fair value. When we recognize an impairment loss for assets to be held and used, we depreciate the adjusted carrying amount of those assets over their estimated remaining useful life. We also perform a test for recoverability when management has committed to a plan to sell or otherwise dispose of an asset group. Assets to be disposed of are reported at the lower of carrying amount or fair value less cost to sell. There were no events or changes in circumstances that indicated the carrying amounts of our long-lived held and used assets were not recoverable during the years ended December 31, 20 20 , 201 9 or 201 8 . For the years ended December 31, 20 20 , 201 9 and 201 8 we recorded loss es on disposal of property, plant and equipment of approximately $ 0 , $ million and $ million, respectively. TIMBER AND TIMBERLANDS Timber and timberlands are valued at cost less accumulated depletion and amortization. We capitalize costs related to stand establishment, which include the preparation of the land for planting, seeds or seedlings and tree planting costs, which include third-party labor costs, materials and other contract services. Upon completion of planting activities and field inspection to confirm the planting operation was successful, a plantation is considered “established.” Subsequent expenditures to maintain the integrity or enhance the growth of an established plantation or stand are expensed. Post-establishment expenses include vegetation control, fertilization, thinning operations and the replanting of seedlings lost through mortality. Forest management costs are considered current operating expenses and include property taxes and insurance, silviculture costs incurred subsequent to stand establishment, cruising of timber volume, property maintenance, salaries, supplies, travel, record-keeping, fire protection and other normal recurring administrative personnel costs. Timberland acquisitions are capitalized based on the relative appraised values of timberland, merchantable timber, pre-production timber (young growth that is not yet merchantable timber), logging roads and other land improvements. The estimated volume of current standing merchantable timber, which is a component of calculating our depletion rates, is updated at least annually to reflect increases due to the reclassification of pre-production timber to merchantable timber when it meets defined diameter specifications, the annual growth of merchantable timber and the acquisition of additional merchantable timber, decreases due to timber harvests and land sales and changes resulting from other factors, such as casualty losses. Timber volumes are estimated from cruises of the timber tracts, which are completed on our timberlands on approximately a five to ten year cycle. Depletion represents the amount charged to expense as timber is harvested. Rates at which timber is depleted are calculated annually for each of our depletion pools by dividing the beginning of year balance of the merchantable timber accounts by the volume of standing merchantable timber, after estimated timber volume updates. The base cost of logging roads, such as clearing, grading and ditching, is not amortized and remains a capitalized item until disposition. Other portions of the initial logging road cost, such as bridges, culverts and gravel surfacing are amortized over their useful lives, which range from 5 to 20 years. Costs associated with temporary logging road spurs, which are typically used for one harvest season, are expensed as incurred. See Note 7: Timber and Timberlands INTANGIBLE ASSETS We recorded intangible assets in connection with the Deltic merger in 2018. We have both indefinite-lived and long-lived intangible assets. Long-lived intangible assets include customer relationships and certain trade names we estimate have a finite life and are being amortized over 10 and 20 years, respectively, and are evaluated for impairment under our Recovery of Long-Lived Assets policy described above. At December 31, 2020 and 2019 the gross carrying amount of our long-lived intangible assets were $8.4 million and accumulated amortization was $2.3 million and $1.5 million, respectively. Amortization expense totaled $0.8 million in 2020, 2019 and 2018 and is estimated to be $0.8 million annually for the next five years. Our i ndefinite - lived intangible assets were $ 10.2 million at December 31, 2020 and 2019 and are not amortized . Rather, they are tested for potential impairments annually as of October 1, or during the year if an event or other circumstance indicates that we may not be able to recover the carrying amount of the assets. We did not impair any intangible assets during the years ended December 31, 2020, 2019 or 2018. COMPANY OWNED LIFE INSURANCE We are the beneficiary of insurance policies on the lives of certain past officers and employees. We have recognized the amount that could be realized upon surrender of the insurance policies in other assets in our Consolidated Balance Sheets Consolidated Statements of Operations Consolidated Statements of Cash Flows . DERIVATIVE INSTRUMENTS We use, from time to time, certain derivative instruments to mitigate exposure to volatility in interest rates and effectively convert a portion of floating rate debt to a fixed rate basis, thus reducing the impact of interest rate changes on future interest expense and cash flows. All derivatives, whether designated as a hedging relationship or not, are recorded in the Consolidated Balance Sheets For a cash flow hedge, the fair value of the effective portion of the derivative is recognized as an asset or liability with a corresponding amount in Accumulated Other Comprehensive Loss Consolidated Balance Sheets . Accumulated Other Comprehensive Loss If a hedge ceases to qualify for hedge accounting, the contract would continue to be carried on the balance sheet at fair value until settled and adjustments to the contract’s fair value would be recognized in earnings. If a forecasted transaction were no longer probable of occurring, amounts previously deferred in Accumulated Other Comprehensive Loss We have International Swap Dealers Association ("ISDA") Master Agreements with each counterparty that permits the net settlement of amounts owed under the respective contracts. The ISDA Master Agreement is an industry standardized contract that governs all derivative contracts entered into between the company and the respective counterparty. Under these master netting agreements, net settlement generally permits the company or the counterparty to determine the net amount payable or receivable for contracts due on the same date for similar types of derivative transactions. We have not elected to offset the fair value positions of the derivative contracts recorded in the Consolidated Balance Sheets Note: 11 Derivative Instruments FAIR VALUE MEASUREMENTS We use a fair value hierarchy in accounting for certain nonfinancial assets and liabilities including long-lived assets (asset groups) measured at fair value for an impairment assessment and pension plan assets measured at fair value. The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions. The fair value hierarchy consists of the following three levels: • Level 1: Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets. • Level 2: Inputs are quoted prices in non-active markets for which pricing inputs are observable either directly or indirectly at the reporting date. • Level 3: Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are observed. See Note: 12 Fair Value Measurements EQUITY-BASED COMPENSATION Equity-based awards are measured at estimated fair value on the dates they are granted or modified. These measurements establish the cost of the equity-based awards for accounting purposes. Equity-based compensation expense is recognized over the awards’ applicable vesting period using the straight-line method. The impact of stock award forfeitures on compensation expense is recognized at the time of forfeit as no estimate of future stock award forfeitures is considered in our calculation of equity-based compensation expense. See Note 13: Equity-Based Compensation Plans LEASES We lease certain equipment, office space and land. Right-of-use (ROU) assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating and finance lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate in determining the present value of lease payments. We consider our recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating our incremental borrowing rates. Most leases include one or more options to renew, with renewal terms that can extend the lease term between one to five years. The exercise of lease renewal options is at our sole discretion. Under the operating lease model, lease expense is recognized on a straight-line basis over the lease term. Under the finance lease model, lease expense consists of the amortization of the ROU asset on a straight-line basis over the asset’s estimated useful life and interest expense calculated using the effective interest method. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Certain of our rental payments are adjusted periodically for inflation. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants and we do not have any significant sublease income. See Note 14: Leases INCOME TAXES We use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases, operating loss carryforwards and tax credit carryforwards. Deferred tax assets and liabilities are measured pursuant to tax laws using rates expected to apply to taxable income in the years in which the temporary differences are expected to be recovered or settled. We recognize the effect of a change in income tax rates on deferred tax assets and liabilities in the Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income in the period that includes the enactment date of the rate change. We record a valuation allowance to reduce the carrying amounts of deferred tax assets if it is more likely than not that such deferred tax assets will not be realized. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities. The determination is based on the technical merits of the position and presumes that each uncertain tax position will be examined by the relevant taxing authority that has full knowledge of all relevant information. See Note 15: Income Taxes PENSION AND OTHER POSTRETIREMENT BENEFITS We recognize any overfunded or underfunded status of our defined benefit pension and other postretirement plans on our Consolidated Balance Sheets • costs of benefits provided in exchange for employees’ services rendered; • interest cost of the obligation; • expected long-term return on plan assets for funded plans; • amortization of prior service costs and plan amendments over the average remaining service period of the active employee group covered by the plan; and • amortization of cumulative unrecognized net actuarial gains and losses – generally in excess of 10 percent of the greater of the benefit obligation or market-related value of plan assets at the beginning of the year – over the average remaining service period of the active employee group covered by the plan. Different assumptions would change the net periodic pension and postretirement benefit costs and the obligation of the benefit plans. See Note 16: Savings Plans, Pension Plans and Other Postretirement Employee Benefits COMMITMENTS, CONTINGENCIES AND LEGAL MATTERS We accrue estimates for resolution of any legal and other contingencies when losses are probable and estimable, in accordance with ASC 450, Contingencies. At any given time, we are subject to claims and actions incidental to the operations of our business. Based on information currently available, we do not expect that any sums we may receive or have to pay in connection with any legal proceeding would have a materially adverse effect on our consolidated financial position, operating results or net cash flow. NEW ACCOUNTING PRONOUNCEMENTS New Accounting Standards Adopted in 2020 In August 2018, the FASB issued ASU No. 2018-15 Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract Consolidated Financial Statements In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Topic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement New Accounting Standards Not Yet Adopted In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting Consolidated Financial Statements

Mergers and Divestitures

Mergers and Divestitures	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Mergers and Divestitures	NOTE 2. MERGERS AND DIVESTITURES Merger with Deltic On February 20, 2018 (merger date), Deltic merged into a wholly owned subsidiary of Potlatch Corporation. Deltic owned approximately 530,000 acres of timberland, operated two sawmills, a medium density fiberboard facility (MDF) and was engaged in real estate development primarily in Arkansas. The acquisition of total assets of $1.4 billion was a noncash investing and financing activity comprised of $1.1 billion in equity consideration transferred to Deltic shareholders and $0.3 billion of liabilities assumed. We expensed approximately $22.1 million of merger-related costs during the year ended December 31, 2018 consisting of: • $12.2 million of merger-related costs for professional fees such as investment banker fees, legal, accounting and appraisal services; and • $9.9 million of restructuring related costs primarily for termination benefits, which included $1.8 million of share-based payments associated with the acceleration of 35,000 replacement restricted stock units for qualifying terminations. These costs are included in Deltic merger-related costs in our Consolidated Statements of Operations . The amount of revenue and income before taxes from the acquired Deltic operations included in our Consolidated Statement of Operations The following summarizes unaudited pro forma information that presents combined amounts as if the merger occurred at the beginning of 2017: Year Ended December 31, (in thousands, except per share amounts) 2018 Net sales $ 1,013,242 Net earnings attributable to PotlatchDeltic common shareholders $ 145,685 Basic earnings per share attributable to PotlatchDeltic common shareholders $ 2.16 Diluted earnings per share attributable to PotlatchDeltic common shareholders $ 2.15 Pro forma net earnings attributable to PotlatchDeltic common shareholders excludes $27.6 million of non-recurring merger-related costs incurred by both companies during the year ended December 31, 2018, of which $5.5 million were incurred by Deltic prior to the merger. Pro forma basic and diluted earnings per share assumes issuance of 22.0 million shares that were issued at the merger date and the issuance of 4.8 million shares for the Deltic earnings and profits special distribution as of the beginning of 2017. Pro forma data may not be indicative of the results that would have been obtained had these events occurred at the beginning of the periods presented, nor is it intended to be a projection of future results. Sale of Deltic MDF Facility In February 2019 we sold our Deltic Medium Density Fiberboard (MDF) facility to Roseburg Forest Products Co. for $92.0 million, consisting of $63.0 million in cash and assumption of $29.0 million of revenue bonds. The price was subject to post-closing adjustments for certain changes in working capital as defined in the purchase and sale agreement. The transaction resulted in a $9.2 million pre-tax gain on sale. Total cash proceeds received after working capital adjustments, closing costs and other expenses were approximately $59.8 million, of which $1.0 million was received in 2020 after satisfaction of certain covenants as outlined in the purchase and sale agreement. discontinued operations.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Segment Information	NOTE 3. SEGMENT INFORMATION Our operations are organized into three reportable segments: Timberlands, Wood Products and Real Estate. Management activities in the Timberlands segment include planting and harvesting trees and building and maintaining roads. The Timberlands segment also generates revenues from non-timber resources such as hunting leases, recreation permits and leases, mineral rights contracts, oil and gas royalties and carbon sequestration. The Wood Products segment manufactures and markets lumber and plywood. The Real Estate segment includes the sale of land holdings deemed non-strategic or identified as having higher and better use alternatives, master planned community development and a country club. Sales outside of the United States are inconsequential and no single customer represented more than 10% of our consolidated revenues during 2020, 2019 or 2018. Our Timberlands segment supplies our Wood Products segment with a portion of its wood fiber needs. These intersegment revenues are based on prevailing market prices and typically represent a sizeable portion of the Timberlands segment’s total revenues. Our other segments generally do not generate intersegment revenues. These intercompany transactions are eliminated in consolidation. The reportable segments follow the same accounting policies used for our Consolidated Financial Statements, Note 1: Summary of Significant Accounting Policies The following table represents our revenues by major product: Year Ended December 31, (in thousands) 2020 2019 2018 Timberlands Northern region Sawlogs $ 213,030 $ 161,570 $ 205,977 Pulpwood 4,502 5,767 5,996 Stumpage 316 109 176 Other 1,581 1,970 1,801 Total Northern revenues 219,429 169,416 213,950 Southern region Sawlogs 93,828 88,048 81,460 Pulpwood 49,084 53,315 48,585 Stumpage 4,077 1,666 2,434 Other 10,101 10,248 8,521 Total Southern revenues 157,090 153,277 141,000 Total Timberlands revenues 376,519 322,693 354,950 Wood Products Lumber 573,069 396,648 464,180 Residuals and Panels 125,336 143,760 216,751 Total Wood Products revenues 698,405 540,408 680,931 Real Estate Rural real estate 81,979 49,675 36,024 Development real estate 14,979 22,363 12,852 Other 7,458 6,834 5,690 Total Real Estate revenues 104,416 78,872 54,566 Total segment revenues 1,179,340 941,973 1,090,447 Intersegment Timberlands revenues 1 (138,410 ) (114,875 ) (115,868 ) Total consolidated revenues $ 1,040,930 $ 827,098 $ 974,579 1 Intersegment revenues represent logs sold by our Timberlands segment to the Wood Products segment. Management primarily evaluates the performance of its segments and allocates resources to them based upon Adjusted EBITDDA. EBITDDA is calculated as net income before interest expense, income taxes, basis of real estate sold, depreciation, depletion and amortization. Adjusted EBITDDA further excludes certain specific items that are considered to hinder comparison of the performance of our businesses either year-on-year or with other businesses. Management uses Adjusted EBITDDA to compare the operating performance of our segments on a consistent basis and to evaluate the performance and effectiveness of each segment’s operational strategies. Our calculation of Adjusted EBITDDA may not be comparable to that reported by other companies. The following table summarizes information for each of the company’s reportable segments and includes a reconciliation of Total Adjusted EBITDDA to income before income taxes. Corporate information is included to reconcile segment data to the Consolidated Financial Statements Year Ended December 31, (in thousands) 2020 2019 2018 Adjusted EBITDDA: Timberlands $ 182,802 $ 133,987 $ 169,834 Wood Products 176,095 12,901 130,583 Real Estate 86,476 62,650 40,304 Corporate (48,451 ) (36,257 ) (37,785 ) Eliminations and adjustments (14,694 ) 5,662 (5,743 ) Total Adjusted EBITDDA 382,228 178,943 297,193 Interest expense, net 1 (29,463 ) (30,361 ) (35,227 ) Depreciation, depletion and amortization (76,261 ) (70,417 ) (70,848 ) Basis of real estate sold (25,348 ) (20,554 ) (16,698 ) Loss on extinguishment of debt — (5,512 ) — Pension settlement charge (42,988 ) — — Non-operating pension and other postretirement employee benefits (14,226 ) (3,739 ) (7,648 ) Gain (loss) on fixed assets 11 (865 ) (725 ) Gain on sale of facility — 9,176 — Inventory purchase price adjustment in cost of goods sold 2 — — (1,849 ) Deltic merger-related costs 3 — — (22,119 ) Income before income taxes $ 193,953 $ 56,671 $ 142,079 1 Includes amortization of bond discounts and deferred loan fees. 2 The effect of costs of goods sold for fair value adjustments to the carrying amounts of inventory acquired in business combinations. See Note 2: Mergers and Divestitures. 3 See Note 2: Mergers and Divestitures. The following table summarizes additional reportable segment financial information: Year Ended December 31, (in thousands) 2020 2019 2018 Depreciation, depletion and amortization: Timberlands $ 51,047 $ 46,601 $ 48,201 Wood Products 23,611 22,059 21,416 Real Estate 620 678 418 Corporate 983 1,079 813 76,261 70,417 70,848 Bond discount and deferred loan fees 1 1,624 1,688 2,313 Total depreciation, depletion and amortization $ 77,885 $ 72,105 $ 73,161 Basis of real estate sold: Real Estate $ 25,990 $ 20,749 $ 16,954 Elimination and adjustments (642 ) (195 ) (256 ) Total basis of real estate sold $ 25,348 $ 20,554 $ 16,698 Assets: Timberlands 2 1,617,809 1,655,407 1,693,162 Wood Products 421,066 398,465 456,306 Real Estate 3 89,509 87,421 93,208 2,128,384 2,141,293 2,242,676 Corporate 252,681 93,766 83,176 Total consolidated assets $ 2,381,065 $ 2,235,059 $ 2,325,852 Capital Expenditures: 4 Timberlands $ 16,252 $ 17,500 $ 17,232 Wood Products 21,565 37,232 27,341 Real Estate 5 7,088 8,053 5,987 44,905 62,785 50,560 Corporate 728 1,317 1,747 Total capital expenditures $ 45,633 $ 64,102 $ 52,307 1 Included within interest expense on the Consolidated Statements of Operations. 2 We do not report rural real estate separate from Timberlands as we do not report these assets separately to management. 3 Real Estate assets primarily consist of the master planned community development and a country club, both located in Arkansas. 4 Does not include the acquisition of timber and timberlands, all of which were acquired by the Timberlands segment. 5 Real Estate capital expenditures include development expenditures of $6.7 million, $7.3 million and $5.0 million for the years ended December 31, 2020, 2019 and 2018, respectively.

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings per Share	NOTE 4. EARNINGS PER SHARE The following table reconciles the number of shares used in calculating basic and diluted earnings per share for the years ended December 31: (in thousands) 2020 2019 2018 Basic weighted-average shares outstanding 67,237 67,608 60,534 Incremental shares due to: Performance shares 289 109 230 Restricted stock units 42 26 34 Stock portion of earnings and profits distribution — — 1,016 Diluted weighted-average shares outstanding 67,568 67,743 61,814 For stock-based awards, the dilutive effect is calculated using the treasury stock method. Under this method, the dilutive effect is computed as if the awards were exercised at the beginning of the period (or at time of issuance, if later) and assumes the related proceeds were used to repurchase common stock at the average market price during the period. Related proceeds include future compensation cost associated with the stock award. At December 31, 2020, 2019 and 2018, there were approximately 1,100, 49,500, and 42,000 stock-based awards, respectively, which were excluded from the calculation of earnings per share because they were anti-dilutive. Anti-dilutive stock-based awards could be dilutive in future periods. Share Issuance Related to the Deltic Merger In February 2018, we issued 22.0 million shares in connection with the Deltic merger. On August 30, 2018, the board of directors approved a special distribution of $222.0 million, or approximately $3.54 per share. The special distribution amount equaled the company’s determination of the accumulated earnings and profits of Deltic as of the merger date and was distributed in order to maintain the company’s qualification as a REIT for U.S. federal income tax purposes. The special distribution 4.8 Note 2: Mergers and Divestitures Share Repurchase Program On August 30, 2018, our board of directors authorized management to repurchase up to $100.0 million of common stock with no time limit set for the repurchase (the Repurchase Program). Shares under the Repurchase Program may be repurchased in open market transactions, including pursuant to a trading plan adopted in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934 (the Trading Plan). The timing, manner, price and amount of repurchases will be determined according to the Trading Plan, and, subject to the terms of the Trading Plan and the Repurchase Program may be suspended, terminated or modified at any time for any reason. Total shares repurchased under the Repurchase Program for the years ended December 31, 2020 and 2019 were 489,850 and 686,240, respectively, for total consideration of $15.4 million and $25.2 million, respectively. No shares were repurchased during 2018 under the Repurchase Program. All common stock purchases were made in open-market transactions. At December 31, 2020, we had remaining authorization of $59.5 million for future stock repurchases under the Repurchase Program. We record share purchases upon trade date, as opposed to the settlement date. We retire shares upon repurchase . Any excess repurchase price over par is recorded in accumulated deficit. There were no unsettled repurchases at December 31, 2020 and 2019. Dividend On February 12, 2021 the board of directors approved a quarterly cash dividend of $0.41 per share payable on March 31, 2021 to stockholders of record as of March 5, 2021.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventories	NOTE 5. INVENTORIES Inventories consist of the following at December 31: (in thousands) 2020 2019 Logs $ 31,210 $ 33,313 Lumber, plywood and veneer 34,136 31,639 Materials and supplies 14,939 12,831 80,285 77,783 Less: LIFO reserve (18,249 ) (12,002 ) Total inventories $ 62,036 $ 65,781 If the last-in, first-out inventory had been carried at average cost, the values would have been higher by approximately $18.2 million and $12.0 million at December 31, 2020 and 2019, respectively.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Property, Plant and Equipment	NOTE 6. PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment consist of the following at December 31: (in thousands) Range of useful lives 2020 2019 Land $ 7,333 $ 7,875 Buildings and improvements 10-40 years 126,576 123,342 Machinery and equipment 2-25 years 377,782 360,570 Construction in progress 6,020 6,326 517,711 498,113 Less: accumulated depreciation (229,167 ) (211,730 ) Total property, plant and equipment, net $ 288,544 $ 286,383 Depreciation expense for property and equipment was $25.2 million, $23.9 million and $22.8 million in 2020, 2019 and 2018, respectively.

Timber and Timberlands

Timber and Timberlands	12 Months Ended
	Dec. 31, 2020
Timber And Timberlands [Abstract]
Timber and Timberlands	NOTE 7. TIMBER AND TIMBERLANDS Timber and Timberlands consist of the following at December 31: (in thousands) 2020 2019 Timber and timberlands $ 1,516,788 $ 1,554,882 Logging roads 83,273 83,781 Total timber and timberlands, net $ 1,600,061 $ 1,638,663 Depletion from company-owned lands totaled $46.3 million, $41.7 million and $43.9 million in 2020, 2019 and 2018, respectively. Amortization of road costs, such as bridges, culverts and gravel surfacing, totaled $3.6 million, $3.6 million and $3.4 million in 2020, 2019 and 2018, respectively. Future payments due under timber cutting contracts at December 31, 2020 were $17.6 million.

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2020
Other Assets [Abstract]
Other Assets	NOTE 8. OTHER ASSETS Other Current Assets consist of the following at December 31: (in thousands) 2020 2019 Real estate held for sale $ 8,818 $ 10,974 Prepaid expenses 4,032 3,097 Tax receivables — 1,341 Other 3,286 4,771 Total other current assets $ 16,136 $ 20,183 Other Long-Term Assets consist of the following at December 31: (in thousands) 2020 2019 Interest rate swaps $ 18,466 $ 1,601 Operating leases 11,081 15,772 Mineral rights 4,825 5,254 Investment in company owned life insurance (COLI), net 3,328 4,157 Real estate development costs 3,748 3,776 Debt issuance costs 1,288 1,846 Restricted cash — 944 Other 3,981 1,940 Total other long-term assets $ 46,717 $ 35,290

Accounts Payable and Accrued Li

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2020
Accounts Payable And Accrued Liabilities Current And Noncurrent [Abstract]
Accounts Payable and Accrued Liabilities	NOTE 9. ACCOUNTS PAYABLE AND ACCRUED LIABILITIES Accounts Payable and Accrued Liabilities consist of the following at December 31: (in thousands) 2020 2019 Accrued payroll and benefits $ 29,675 $ 12,920 Accounts payable 9,724 12,734 Accrued interest 6,485 6,946 Accrued taxes 20,780 6,638 Deferred revenue 1 8,789 5,514 Operating lease liabilities 4,304 4,998 Other current liabilities 13,522 10,827 Total accounts payable and accrued liabilities $ 93,279 $ 60,577 1

Debt

Debt	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Debt	NOTE 10. DEBT Long-term debt consists of the following at December 31: (in thousands) 2020 2019 Variable rate term loans 1 $ 403,500 $ 397,500 Fixed rate term loans 2 290,000 296,000 Revenue bonds 3 65,735 65,735 Medium-term notes 4 3,000 3,000 Long-term principal 762,235 762,235 Debt issuance costs (1,857 ) (2,086 ) Unamortized discounts (3,031 ) (3,680 ) Total long-term debt 757,347 756,469 Less: current portion of long-term debt (39,981 ) (45,974 ) Long-term debt $ 717,366 $ 710,495 1 Variable rate term loans are at rates of one or three-month LIBOR plus a spread between 1.85% and 2.15% and mature between 2021 and 2030. At December 31, 2020, the one and three-month LIBOR rates were 0.16% and 0.23%, respectively. We have entered into interest rate swaps for these variable rate term loans to fix the interest rate. See Note 11: Derivative Instruments 2 Fixed rate term loans are at rates between 4.05% and 4.64% and mature between 2022 and 2025. 3 Revenue bonds have a fixed rate of 2.75% and mature in 2024. 4 Medium term notes have a fixed rate of 8.75% and mature in 2022 . TERM LOANS In January 2019, through a first amendment to the Second Amended and Restated Term Loan Agreement (Amended Term Loan Agreement) with our primary lender, we refinanced $150.0 million of 7.5% senior notes (Senior Notes) with a $150.0 million term loan that matures in 2029. The new term loan carries a variable interest rate of one-month LIBOR plus 1.85%. We paid $0.5 million of lender fees on the new term loan. Concurrent with the new term loan, we entered into a $150.0 million interest rate swap to fix the rate at 4.56% before patronage. Upon refinancing, we redeemed and paid all outstanding Senior Notes including a redemption premium of $4.9 million which is included in the loss on extinguishment of debt in our Consolidated Statements of Operations In December 2019, we refinanced an existing $40.0 million term loan that matured through a second amendment to the Amended Term Loan Agreement. The new term loan carries a variable interest rate of one-month LIBOR plus 1.85% and matures in 2029. In conjunction with the new term loan we entered into a $40.0 million interest rate swap to fix the rate at 3.17% before patronage. In December 2020, through a fourth amendment to the Amended Term Loan Agreement, we refinanced existing terms loans of $46.0 million that matured with a new term loan that matures in 2030. The new term loan carries a variable interest rate of one-month LIBOR plus 2.10%. In conjunction with the new term loan we entered into $46.0 million of interest rate swaps to fix the rate at 3.04% before patronage. See Note 11: Derivative Instruments At December 31, 2020, $693.5 million was outstanding under our Amended Term Loan Agreement. DEBT ISSUANCE COSTS AND UNAMORTIZED DISCOUNTS Debt issuance costs represent the capitalized direct costs incurred related to the issuance of debt. These costs are amortized to interest expense over the terms of the respective borrowings. Unamortized discounts include a $4.9 million fair value adjustment to the $100.0 million term loan assumed in the Deltic merger. The unamortized balance of the fair value adjustment at December 31, 2020, was $3.0 million and will be amortized through the term loan’s maturity in 2025. DEBT MATURITIES Scheduled principal payments due on long-term debt at December 31, 2020 are as follows: (in thousands) 2021 $ 40,000 2022 43,000 2023 40,000 2024 175,735 2025 100,000 Thereafter 363,500 Total $ 762,235 CREDIT AGREEMENT On February 14, 2018, we entered into a Second Amended and Restated Credit Agreement (Amended Credit Agreement) with an expiration date of April 13, 2023. The Amended Credit Agreement increased our revolving line of credit to $380.0 million, which may be increased by up to an additional $420.0 million. It also includes a sublimit of $75.0 million for the issuance of standby letters of credit and a sublimit of $25.0 million for swing line loans. Usage under either or both subfacilities reduces availability under the revolving line of credit. We may also utilize borrowings under the Amended Credit Agreement to, among other things, refinance existing indebtedness and provide funding for working capital requirements, capital projects, acquisitions and other general corporate expenditures. Pricing is set according to the type of borrowing. LIBOR Loans are issued at a rate equal to the LIBOR Rate, while Base Rate Loans are issued at a rate equal to a Base Rate, which is a fluctuating rate per annum equal to the highest of (a) the Federal Funds Rate plus one half FINANCIAL COVENANTS The Amended Term Loan Agreement and the Amended Credit Agreement (collectively referred to as the Agreements) contain certain covenants that limit our ability and that of our subsidiaries to create liens, merge or consolidate, dispose of assets, incur indebtedness and guarantees, repurchase or redeem capital stock and indebtedness, make certain investments or acquisitions, enter into certain transactions with affiliates or change the nature of our business. The Agreements also contain financial maintenance covenants including the maintenance of a minimum interest coverage ratio and a maximum leverage ratio. We are permitted to pay dividends to our stockholders under the terms of the Agreements so long as we expect to remain in compliance with the financial maintenance covenants. We were in compliance with all debt and credit agreement covenants at December 31, 2020.

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2020
Derivative Instrument Detail [Abstract]
Derivative Instruments	NOTE 11. DERIVATIVE INSTRUMENTS From time to time, we enter into derivative financial instruments to manage certain cash flow and fair value risks. Derivatives designated and qualifying as a hedge of the exposure to variability in the cash flows of a specific asset or liability that is attributable to a particular risk, such as interest rate risk, are considered cash flow hedges. As of December 31, 2020, we have seven interest rate swaps associated with $403.5 million of term loan debt. These cash flow hedges convert variable rates ranging from one-month and three-month LIBOR plus 1.85% to 2.15%, to fixed rates ranging from 3.04% to 4.82%. Our cash flow hedges are expected to be highly effective in achieving the offsetting of cash flows attributable to the hedged interest rate risk through the term of the hedge. At December 31, 2020, the amount of net losses expected to be reclassified into earnings in the next 12 months is approximately $9.0 million. In March 2020, we entered into $653.5 million of forward starting interest rate swaps designated as cash flow hedges. These forward starting interest rate swaps effectively hedge the variability in future benchmark interest payments attributable to changes in interest rates on $46.0 million of existing debt and $607.5 million of future debt refinances through January 2029 by converting the benchmark interest rates to fixed interest rates. In addition, the cash flow hedges for future debt refinances require settlement on the stated maturity date. In December 2020, we refinanced $46.0 million of existing term loans that matured with a new term loan maturing December 2030. Upon completing the refinance of the term loans, we redesignated $46.0 million of the forward starting interest rate swaps with terms consistent with the new term loan, which fixed the rate on the borrowings at 3.04% before patronage. Derivatives not designated as hedges are not speculative and are used to manage our exposure to interest rate movements, commodity price movements or other identified risks, but do not meet the strict hedge accounting requirements. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly into income. The fair values of our cash flow derivative instruments on our Consolidated Balance Sheets Asset Derivatives Liability Derivatives (in thousands) Location 2020 2019 Location 2020 2019 Derivatives designated in cash flow hedging relationships: Interest rate contracts Other assets, current $ 63 $ — Accounts payable and accrued liabilities $ 1,010 $ — Interest rate contracts Other assets, non-current $ 18,466 $ 1,601 Other long-term obligations $ 45,100 $ 22,398 The following table details the effect of derivatives on our Consolidated Statements of Operations Year Ended December 31, (in thousands) Location 2020 2019 2018 Derivatives designated in cash flow hedging relationships: Interest rate contracts Loss recognized in other comprehensive income, net of tax $ (14,632 ) $ (19,824 ) $ (3,062 ) Loss reclassified from accumulated other comprehensive loss, net of tax 1 Interest expense $ (7,451 ) $ (1,384 ) $ (647 ) Interest expense, net $ 29,463 $ 30,361 $ 35,227 1 Realized gains and losses on interest rate contracts consist of net cash received or paid and interest accruals on the interest rate swaps during the periods. Net cash received or paid is included in the supplemental cash flow information within interest, net of amounts capitalized in the Consolidated Statements of Cash Flows .

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Derivative Instrument Detail [Abstract]
Fair Value Measurements	NOTE 12. FAIR VALUE MEASUREMENTS Carrying amounts and estimated fair values of our financial instruments as of December 31 are as follows: 2020 2019 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Derivative assets related to interest rate swaps (Level 2) $ 18,529 $ 18,529 $ 1,601 $ 1,601 Derivative liabilities related to interest rate swaps (Level 2) $ (46,110 ) $ (46,110 ) $ (22,398 ) $ (22,398 ) Long-term debt, including current portion (Level 2): Term loans $ (690,469 ) $ (716,631 ) $ (689,820 ) $ (703,437 ) Revenue bonds (65,735 ) (67,885 ) (65,735 ) (68,200 ) Medium-term notes (3,000 ) (3,545 ) (3,000 ) (3,480 ) Total long-term debt 1 $ (759,204 ) $ (788,061 ) $ (758,555 ) $ (775,117 ) Company owned life insurance (Level 3) $ 3,328 $ 3,328 $ 4,157 $ 4,157 1 The fair value of interest rate swaps are determined using a discounted cash flow analysis on the expected cash flows of each derivative. The analysis reflects the contractual terms of the derivatives, including the period to maturity and uses observable market-based inputs, including interest rate forward curves. The fair value of our long-term debt is estimated based upon quoted market prices for similar debt issues or estimated based on average market prices for comparable debt when there is no quoted market price. The contract value of our company owned life insurance is based on the amount at which it could be redeemed and, accordingly, approximates fair value. We believe that our other financial instruments, including cash and cash equivalents, receivables and payables have net carrying value that approximates their fair value with only insignificant differences. This is primarily due to the short-term nature of these instruments.

Equity-Based Compensation Plans

Equity-Based Compensation Plans	12 Months Ended
	Dec. 31, 2020
Share Based Compensation [Abstract]
Equity-Based Compensation Plans	NOTE 13. EQUITY-BASED COMPENSATION PLANS We issue new shares of common stock to settle performance stock awards (PSAs), restricted stock units (RSUs) and deferred compensation stock equivalent units. At December 31, 2020, approximately 1.2 million shares were authorized for future use under our long-term incentive plans. The following table details our compensation expense and the related income tax benefit for the years ended December 31: (in thousands) 2020 2019 2018 Employee equity-based compensation expense: Performance stock awards $ 5,083 $ 4,605 $ 4,157 Restricted stock units 2,904 2,595 2,024 Deferred compensation stock equivalent units expense 76 72 213 Accelerated share-based termination benefits in connection with the merger — — 1,812 Total equity-based compensation expense $ 8,063 $ 7,272 $ 8,206 Total tax benefit recognized for shared-based payment awards $ 357 $ 314 $ 332 PERFORMANCE STOCK AWARDS PSAs granted under the stock incentive plans have a three-year three-year three-year Since the awards contain a market condition, the effect of the market condition is reflected in the grant-date fair value, which is estimated using a Monte Carlo simulation. This method is used to estimate the stock prices of PotlatchDeltic and the selected peer companies at the end of the three-year performance period. The Monte Carlo simulation uses inputs such as stock prices and expected volatility of PotlatchDeltic and the peer group of companies as of the award date. Multiple simulations are generated, resulting in share prices and total shareholder return values for PotlatchDeltic and the peer group of companies. For each simulation, the total shareholder return of PotlatchDeltic is ranked against that of the peer group of companies. The future value of the performance share unit is calculated based on a multiplier for the median outperformance and percentile ranking and then discounted to present value. The discount rate is the risk-free rate as of the award date for a term consistent with the performance period. Awards are also credited with dividend equivalents at the end of the performance period, and as a result, award values are not adjusted for dividends. The following table presents the key inputs used in calculating the fair value of the PSAs and the resulting fair values: Year Ended December 31, 2020 2019 2018 Stock price as of valuation date $ 42.16 $ 35.01 $ 54.00 Risk-free rate 1.42 % 2.47 % 2.46 % Expected volatility 25.74 % 25.15 % 23.74 % Expected dividend yield 1 — — 2.96 % Expected term (years) 3.00 3.00 3.00 Fair value of a performance share $ 45.04 $ 37.87 $ 75.37 1 The following table summarizes outstanding PSAs as of December 31 and the changes during each year: 2020 2019 2018 (in thousands, except per share amounts) Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Nonvested shares outstanding at January 1 196,007 $ 50.15 142,238 $ 63.91 200,631 $ 39.19 Granted 125,001 $ 45.04 142,066 $ 37.87 67,747 $ 75.37 Vested (63,456 ) $ 75.37 (75,048 ) $ 53.85 (121,058 ) $ 30.02 Forfeited (4,286 ) $ 47.07 (13,249 ) $ 45.35 (5,082 ) $ 47.90 Nonvested shares outstanding at December 31 253,266 $ 41.36 196,007 $ 50.15 142,238 $ 63.91 Total grant date fair value of PSAs vested during the year $ 4,783 $ 4,041 $ 3,634 Total fair value of PSAs vested during the year $ 3,968 $ 3,561 $ 6,397 Aggregate intrinsic value of nonvested PSAs at December 31 $ 12,668 $ 8,481 $ 4,500 As of December 31, 2020, there was $5.5 million of unrecognized compensation cost related to nonvested PSAs, which is expected to be recognized over a weighted average period of 1.5 years. RESTRICTED STOCK UNITS During 2020, 2019 and 2018, certain directors, officers, and other employees of the company were granted RSU awards that will accrue dividend equivalents based on dividends paid during the RSU vesting period. The dividend equivalents will be converted into additional RSUs that will vest in the same manner as the underlying RSUs to which they relate. Therefore, the shares are not considered participating securities. The terms of the awards state that the RSUs will vest in a given time period of one to three years. The following table summarizes outstanding RSU awards as of December 31 and the changes during each year: 2020 2019 2018 (in thousands, except per share amounts) Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Nonvested shares outstanding at January 1 127,471 $ 39.83 72,020 $ 47.66 67,871 $ 32.87 Granted 68,263 $ 38.77 104,488 $ 36.80 49,193 $ 49.96 Vested (52,908 ) $ 44.48 (43,102 ) $ 45.51 (41,350 ) $ 26.33 Forfeited (3,334 ) $ 40.20 (5,935 ) $ 40.26 (3,694 ) $ 45.36 Nonvested shares outstanding at December 31 139,492 $ 37.54 127,471 $ 39.83 72,020 $ 47.66 Total grant date fair value of RSU awards vested during the year $ 2,354 $ 1,961 $ 1,089 Total fair value of RSU awards vested during the year $ 2,196 $ 1,771 $ 1,328 Aggregate intrinsic value of nonvested RSU awards at December 31 $ 6,977 $ 5,516 $ 2,279 As of December 31, 2020, there was $2.6 million of total unrecognized compensation cost related to nonvested RSU awards, which is expected to be recognized over a weighted average period of 1.3 years. DEFERRED COMPENSATION STOCK EQUIVALENT UNITS A long-term incentive award was granted annually to our directors through December 2017. The awards are payable upon a director's separation from service. Directors may also elect to defer their annual retainers, payable in the form of stock. All stock unit equivalent accounts are credited with dividend equivalents. As of December 31, 2020, there were 177,178 shares outstanding that will be distributed in the future to directors as common stock. Issuance of restricted stock units awarded to certain directors, officers and employees may also be deferred. All stock unit equivalent accounts are credited with dividend equivalents. At December 31, 2020, there were 89,731 vested RSUs for employees where issuance of the related stock had been deferred.

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	NOTE 14. LEASES We account for leases in accordance with ASC Topic 842, Leases Note 1: Summary of Significant Accounting Policies Balance Sheet Classification The following tables provide supplemental balance sheet information related to our leases as of December 31: (in thousands) Classification 2020 2019 Assets Operating lease assets Other long-term assets $ 11,081 $ 15,772 Finance lease assets 1 Property, plant and equipment, net 7,206 2,360 Total lease assets $ 18,287 $ 18,132 Liabilities Current Operating lease liabilities Accounts payable and accrued liabilities $ 4,304 $ 4,998 Finance lease liabilities Accounts payable and accrued liabilities 2,202 644 Noncurrent Operating lease liabilities Other long-term obligations 6,835 10,775 Finance lease liabilities Other long-term obligations 4,914 1,703 Total lease liabilities $ 18,255 $ 18,120 1 Finance lease assets are presented net of accumulated amortization of $1.7 million and $0.3 million as of December 31, 2020 and 2019, respectively. 2020 2019 Weighted-average remaining terms (years) Operating leases 3.80 4.22 Finance leases 3.59 3.83 Weighted-average discount rate Operating leases 4.13 % 4.17 % Finance leases 2.76 % 3.54 % Lease Costs The following table summarizes the components of our lease expense as of December 31: Year Ended December 31, (in thousands) 2020 2019 2018 Operating lease costs 1 $ 5,640 $ 5,938 $ 4,989 Finance lease costs: Amortization of leased assets 1,451 269 — Interest on lease assets 153 40 — Net lease costs $ 7,244 $ 6,247 $ 4,989 1 Excludes short-term leases and variable lease costs, which are immaterial. Operating lease costs and amortization of finance lease assets are included within costs of goods sold and selling, general and administrative expenses and interest on leased assets is included in interest expense, net on our Consolidated Statements of Operations Other Lease Information The following table presents supplemental cash flow information related to leases as of December 31: (in thousands) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 5,627 $ 5,963 Operating cash flows for finance leases $ 153 $ 40 Financing cash flows for finance leases $ 1,526 $ 283 Leased assets exchanged for new lease liabilities: Operating leases $ 447 $ 7,135 Finance leases $ 6,295 $ 2,630 Maturity of Lease Liabilities At December 31, 2020, the future minimum lease payment obligations under noncancelable leases were as follows: (in thousands) Operating Leases Finance Leases 2021 $ 4,670 $ 2,369 2022 2,834 2,278 2023 1,879 1,589 2024 986 868 2025 692 276 After 2025 1,000 91 Total lease payments 12,061 7,471 Less: interest 922 355 Present value of lease liabilities $ 11,139 $ 7,116

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 15. INCOME TAXES As a REIT, we generally are not subject to federal and state corporate income taxes on income from investments in real estate that we distribute to our shareholders. We conduct certain activities through our PotlatchDeltic TRS which are subject to corporate level federal and state income taxes. These activities are principally comprised of our wood products manufacturing operations and certain real estate investments. Therefore, income tax expense or benefit is primarily due to income or loss of the PotlatchDeltic TRS, as well as permanent book versus tax differences. We are also subject to corporate taxes on built-in gains (the excess of fair market value over tax basis on the merger date) on sales of former Deltic real property held by the REIT during the five years following the Deltic merger. The sale of standing timber is not subject to built-in gains tax. Income tax expense consists of the following for the years ended December 31: (in thousands) 2020 2019 2018 Current $ 41,733 $ 12,055 $ 7,038 Deferred (14,610 ) (11,082 ) 11,370 Net operating loss carryforwards — 37 791 Income taxes $ 27,123 $ 1,010 $ 19,199 Income tax expense differs from the amount computed by applying the statutory federal income tax rate of 21% to income before income taxes due to the following for the years ended December 31: (in thousands, except effective tax rate) 2020 2019 2018 U.S. federal statutory income tax $ 40,730 $ 11,901 $ 29,837 REIT income not subject to federal income tax (16,949 ) (11,285 ) (8,773 ) Pension contribution deducted at higher tax rate — — (5,665 ) Change in valuation allowance (395 ) (395 ) — State income taxes, net of federal income tax 4,458 903 3,712 Permanent book-tax differences (1,315 ) (793 ) (771 ) Other items, net 594 679 859 Income taxes $ 27,123 $ 1,010 $ 19,199 Effective tax rate 14.0 % 1.8 % 13.5 % The tax effects of significant temporary differences creating deferred tax assets and liabilities at December 31 were: (in thousands) 2020 2019 Deferred tax assets: Pension and other postretirement employee benefits $ 34,703 $ 32,110 Inventories 552 754 Tax credits 1,519 2,190 Nondeductible accruals 2,005 815 Incentive compensation 971 1,044 Employee benefits 1,323 1,316 Other 1,110 1,296 Total deferred tax assets 42,183 39,525 Valuation allowance — (395 ) Deferred tax assets, net of valuation allowance 42,183 39,130 Deferred tax liabilities: Timber and timberlands, net (354 ) (965 ) Property, plant and equipment, net (52,698 ) (50,901 ) Intangible assets, net (3,656 ) (3,778 ) Real estate development (1,236 ) (1,402 ) Other (1,979 ) (2,249 ) Total deferred tax liabilities (59,923 ) (59,295 ) Deferred tax liabilities, net $ (17,740 ) $ (20,165 ) At December 31, 2020, we had no state or federal net operating loss carryforwards. We have Idaho Investment Tax Credits of $1.9 million that expire from 2026 through 2034. We use the flow-through method of accounting for investment tax credits. We believe it is more likely than not that we will have sufficient future taxable income to realize our deferred tax assets. The following table summarizes the tax years subject to examination by major taxing jurisdictions: Jurisdiction Years Federal 2017 — 2020 Arkansas 2017 — 2020 Idaho 2017 — 2020 Michigan 2016 — 2020 Minnesota 2016 — 2020 At December 31, 2020 and 2019, we had no (in thousands) 2019 Balance at January 1 $ 564 Additions for tax positions of prior years — Reduction for tax positions of prior years (564 ) Balance at December 31 $ — We reflect accrued interest related to tax obligations, as well as penalties, in our provision for income taxes. For the years ended December 31, 2020, 2019 and 2018, we recognized insignificant amounts related to interest and penalties in our tax provision. At December 31, 2020, 2019 and 2018, we had insignificant amounts of accrued interest related to tax obligations and no accrued interest receivable with respect to open tax refunds.

Savings Plans, Pension Plans an

Savings Plans, Pension Plans and Other Postretirement Employee Benefits	12 Months Ended
	Dec. 31, 2020
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Savings Plans, Pension Plans and Other Postretirement Employee Benefits	NOTE 16. SAVINGS PLANS, PENSION PLANS AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS SAVINGS PLANS Substantially all of our employees are eligible to participate in 401(k) savings plans. In 2020, 2019 and 2018, we made matching 401(k) contributions on behalf of our employees of $3.6 million, $3.9 million and $3.7 million, respectively. Certain eligible employees who earn awards under our annual incentive plan are permitted to defer receipt of those awards. These employees may defer receipt of a minimum of 50% and a maximum of 100% of the award pursuant to rules established under our Management Deferred Compensation Plan. Eligible employees may also defer up to 50% of their base salary under the Management Deferred Compensation Plan. At the employee's election, deferrals may be deemed invested in a company stock unit account, a directed investment account with certain deemed investments available under the 401(k) Plan or a combination of these investment vehicles. If company stock units are elected, dividend equivalents are credited to the units. PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS On January 1, 2011, we froze the legacy Potlatch pension plans to any new salaried and hourly non-represented employees hired after that date. Upon merger with Deltic in 2018, we assumed one qualified pension plan, one nonqualified pension plan and an other postretirement benefit (OPEB) plan. The acquired plans have been frozen to new participants since 2014. Effective January 1, 2010, we restructured our OPEB plans. The level of health care subsidy was frozen for retirees so that all future increments in health care costs will be borne by the retirees. In addition, for retirees under age 65, a high deductible medical plan was created and all other existing health care plans were terminated. For retirees age 65 or over, the medical plan is divided into two components, with the company continuing to self-insure prescription drugs and providing a fully-insured medical supplemental plan through AARP/United Healthcare. Both health care plans require the retiree to contribute amounts in excess of the company subsidy in order to continue coverage. The Plan does not pay for vision, dental and life insurance for the retirees. The effect of these retiree plan changes was a reduction in the accumulated postretirement benefit obligation of $ 76.7 million, which was recognized in Accumulated Other Comprehensive Loss as of December 31, 2009 and was fully amortized as of December 31, 2019. In February 2020, we purchased a group annuity contract from an insurance company to transfer $101.1 million of our outstanding pension benefit obligation related to our qualified pension plans to the insurance company. This transaction was funded with plan assets. As a result of the transaction, the insurance company assumed responsibility for annuity administration and benefit payments to select retirees, with no change to their monthly retirement benefit payment amounts. In connection with this transaction we recorded a non-cash pretax settlement charge of $43.0 million as a result of accelerating the recognition of actuarial losses included in accumulated other comprehensive loss that would have been recognized in future periods. The settlement triggered a remeasurement of plan assets and liabilities. We updated the discount rate used to measure our projected benefit obligation for the qualified pension plans as of February 29, 2020 and to calculate the related net periodic benefit cost for the remainder of 2020 to 2.95% from 3.40%. All other pension assumptions were unchanged. The net effect of the remeasurement was a reduction in the funded status of our qualified pension plans in the first quarter of 2020 of approximately $26.2 million, primarily driven by the decrease in the discount rate. We use a December 31 measurement date for our benefit plans and obligations. We recognize the underfunded status of our defined benefit pension plans and OPEB plans obligations on our Consolidated Balance Sheets Consolidated Statements of Operations Changes in benefit obligation, plan assets and funded status for our pension and OPEB plans are as follows: Pension Plans OPEB (in thousands) 2020 2019 2020 2019 Benefit obligation at beginning of year $ (474,237 ) $ (427,909 ) $ (46,395 ) $ (40,032 ) Service cost (8,932 ) (7,767 ) (508 ) (371 ) Interest cost (12,263 ) (18,465 ) (1,502 ) (1,588 ) Actuarial loss (38,366 ) (53,446 ) (6,415 ) (7,997 ) Benefits paid 23,614 33,350 3,985 3,593 Plan settlements 101,755 — — — Benefit obligation at end of year $ (408,429 ) $ (474,237 ) $ (50,835 ) $ (46,395 ) Fair value of plan assets at beginning of year $ 398,468 $ 351,285 $ — $ — Actual return on plan assets 46,672 78,448 — — Employer contributions and benefit payments 6,019 2,085 3,985 3,593 Benefits paid (23,614 ) (33,350 ) (3,985 ) (3,593 ) Plan settlements (101,755 ) — — — Fair value of plan assets at end of year $ 325,790 $ 398,468 $ — $ — Amounts recognized in the consolidated balance sheets: Current liabilities $ (2,363 ) $ (2,152 ) $ (4,211 ) $ (4,549 ) Noncurrent assets 1,907 — — — Noncurrent liabilities (82,183 ) (73,617 ) (46,624 ) (41,846 ) Funded status $ (82,639 ) $ (75,769 ) $ (50,835 ) $ (46,395 ) The accumulated benefit obligation for all defined benefit pension plans is determined using the actuarial present value of the vested benefits to which the employee is currently entitled and the employee’s expected date of separation for retirement. At December 31, 2020 and 2019, the accumulated benefit obligation for all defined benefit pension plans was $390.3 million and $458.1 million, respectively. During 2020 and 2019, funding of pension and other postretirement employee benefit plans was $10.0 million and $5.7 million, respectively. Pension plans with projected benefit obligations greater than plan assets at December 31 are as follows: 2020 2019 Projected benefit obligations $ 350,091 $ 474,237 Fair value of plan assets $ 265,546 $ 398,468 Pension plans with accumulated benefit obligations greater than plan assets at December 31 are as follows: 2020 2019 Accumulated benefit obligations $ 332,012 $ 458,106 Fair value of plan assets $ 265,546 $ 398,468 PENSION ASSETS We utilize formal investment policy guidelines for our company-sponsored pension plan assets. Management is responsible for ensuring the investment policy and guidelines are adhered to and the investment objectives are met. The general policy states that plan assets will be invested to seek the greatest return consistent with the fiduciary character of the pension funds and to allow the plans to meet the need for timely pension benefit payments. The specific investment guidelines stipulate that management will maintain adequate liquidity for meeting expected benefit payments by reviewing, on a timely basis, contribution and benefit payment levels and appropriately revise long-term and short-term asset allocations. Management takes reasonable and prudent steps to preserve the value of pension fund assets and to avoid the risk of large losses. Major steps taken to provide this protection include the following: • Assets are diversified among various asset classes, such as global equities, fixed income, alternatives and liquid reserves. • Periodic reviews of allocations within these ranges are made to determine what adjustments should be made based on changing economic and market conditions and specific liquidity requirements. • Assets are managed by professional investment managers and may be invested in separately managed accounts or commingled funds. • Assets are not invested in PotlatchDeltic stock. The investment guidelines also provide that the individual investment managers are expected to achieve a reasonable rate of return over a market cycle. Emphasis will be placed on long-term performance versus short-term market aberrations. Factors to be considered in determining reasonable rates of return include performance achieved by a diverse cross section of other investment managers, performance of commonly used benchmarks (e.g., MSCI All-Country World Index, Barclays Long Credit Index), actuarial assumptions for return on plan investments and specific performance guidelines given to individual investment managers. The long-term targeted asset allocation ranges for the pension benefit plans’ asset categories are as follows: Asset Category Allocation Range Global equities 26% - 38% Fixed income securities 44% - 64% Alternatives, which may include equities and fixed income securities 10% - 16% Cash and cash equivalents 0% - 5% The asset allocations of the pension benefit plans’ assets at December 31 by asset category are as follows: Pension Plans Asset Category 2020 2019 Global equities 32 % 32 % Fixed income securities 53 54 Other (includes cash and cash equivalents and alternatives) 15 14 Total 100 % 100 % The pension assets are stated at fair value. Refer to Note 1: Summary of Significant Accounting Policies Following is a description of the valuation methodologies used for pension assets measured at fair value: • Level 1 assets include cash and cash equivalents, corporate common and preferred stocks with quoted market prices on major securities markets, and investments in registered investment company funds for which market quotations are generally readily available on the primary market or exchange on which they are traded. • Level 2 assets consist of thinly traded fixed income instruments of varying maturities representing corporate security investments. • Investments in funds that may not be fully redeemed in the near-term are generally classified in Level 3. We had no Level 3 investments at December 31, 2020 or 2019. Assets within our defined benefit pension plans were invested as follows: (in thousands) December 31, 2020 Asset Category Level 1 Level 2 Total Cash and cash equivalents $ 5,571 $ — $ 5,571 Global equity securities 1 104,775 — 104,775 Fixed income securities 2 143,415 29,494 172,909 Alternatives 3 42,535 — 42,535 Total $ 296,296 $ 29,494 $ 325,790 (in thousands) December 31, 2019 Asset Category Level 1 Level 2 Total Cash and cash equivalents $ 6,671 $ — $ 6,671 Global equity securities 1 127,688 — 127,688 Fixed income securities 2 173,464 40,554 214,018 Alternatives 3 50,091 — 50,091 Total $ 357,914 $ 40,554 $ 398,468 1 2 Level 1 assets are investments in a diversified portfolio of fixed income instruments of varying maturities representing corporates, U.S. treasuries, municipals and futures. Level 2 assets are thinly traded investments in a diversified portfolio of fixed income instruments of varying maturities representing mostly corporates securities. Both Level 1 & Level 2 investments track the Bloomberg Barclay’s Long-term Credit Index. 3 Level 1 assets are long-term investment funds which are invested in tangible assets and real asset companies such as, infrastructure, natural resources and timber. PLAN ACTIVITY Pre-tax components of net periodic cost (benefit) recognized in our Consolidated Statements of Operations Pension Plans OPEB (in thousands) 2020 2019 2018 2020 2019 2018 Service cost $ 8,932 $ 7,767 $ 8,454 $ 508 $ 371 $ 341 Interest cost 12,263 18,465 16,992 1,502 1,588 1,482 Expected return on plan assets (15,474 ) (22,190 ) (20,035 ) — — — Amortization of prior service cost (credit) 111 211 186 (1,274 ) (8,844 ) (8,877 ) Amortization of actuarial loss 15,426 13,497 16,589 1,672 1,012 1,311 Net periodic cost (benefit) before pension settlement charge 21,258 17,750 22,186 2,408 (5,873 ) (5,743 ) Pension settlement charge 42,988 — — — — — Net periodic cost (benefit) $ 64,246 $ 17,750 $ 22,186 $ 2,408 $ (5,873 ) $ (5,743 ) The amounts recorded in Accumulated Other Comprehensive Loss Consolidated Balance Sheets Pension Plans OPEB (in thousands) 2020 2019 2020 2019 Net loss $ 78,859 $ 116,780 $ 15,947 $ 12,437 Prior service cost (credit) 166 248 (1,164 ) (2,106 ) Total amount unrecognized $ 79,025 $ 117,028 $ 14,783 $ 10,331 EXPECTED FUNDING AND BENEFIT PAYMENTS We are required to contribute $1.8 million to our qualified pension plans in 2021. Our non-qualified pension plan and other postretirement employee benefit plans are unfunded and benefit payments are paid from our general assets. We estimate that we will make non-qualified pension plan payments of $2.4 million and other postretirement employee benefit payments of $4.2 million in 2021, which are included below. Estimated future benefit payments, which reflect expected future service are as follows for the years indicated: (in thousands) Pension Plans OPEB 2021 $ 21,923 $ 4,211 2022 $ 22,386 $ 3,730 2023 $ 22,649 $ 3,556 2024 $ 22,638 $ 3,274 2025 $ 22,519 $ 3,018 2026–2030 $ 110,216 $ 13,300 ACTUARIAL ASSUMPTIONS The weighted average assumptions used to determine the benefit obligation for non-Deltic plans as of December 31 were: Pension Plans OPEB 2020 2019 2020 2019 Discount rate 2.65 % 3.40 % 2.60 % 3.40 % Rate of salaried compensation increase 3.00 % 3.00 % — — The weighted average assumptions used for non-Deltic plans to determine the net periodic cost (benefit) for the years ended December 31 were: Pension Plans OPEB 2020 2019 2018 2020 2019 2018 Discount rate 3.40 % 4.40 % 3.85 % 3.40 % 4.40 % 3.65 % Expected return on plan assets 5.75 % 6.25 % 6.25 % — — — Rate of salaried compensation increase 3.00 % 3.00 % 3.00 % — — — The weighted average assumptions used to determine the benefit obligation for Deltic plans as of December 31 were: Pension Plans OPEB 2020 2019 2020 2019 Discount rate 2.65 % 3.40 % 2.60 % 3.40 % Rate of salaried compensation increase 4.00 % 4.00 % — — The weighted average assumptions used for Deltic plans to determine the net periodic cost (benefit) for the years ended December 31 were: Pension Plans OPEB 2020 2019 2018 2020 2019 2018 Discount rate 3.40 % 4.40 % 4.30 % 3.40 % 4.40 % 4.30 % Expected return on plan assets 5.75 % 6.25 % 6.25 % — — — Rate of salaried compensation increase 4.00 % 4.00 % 4.00 % — — — The discount rate used in the determination of pension and other postretirement employee benefit obligations was calculated using hypothetical bond portfolios to match the expected benefit payments under each of our pension plans and other postretirement employee benefit obligations based on bonds available at each year end with a rating of "AA" or better. The portfolios were well-diversified over corporate industrial, corporate financial, municipal, federal and foreign government issuers. The expected return on plan assets assumption is based upon an analysis of historical long-term returns for various investment categories, as measured by appropriate indices. These indices are weighted based upon the extent to which plan assets are invested in the particular categories in arriving at our determination of a composite expected return. At December 31, 2020, the assumed health care cost trend rate used to calculate other postretirement employee benefit obligations for the non-Deltic plans was between 6.36% and 7.05%, depending on the plan participant make up, and for Deltic plans a rate of 6.78% was utilized, with both Deltic and non-Deltic plans grading ratably to an assumption of 4.50% in 2038. The actual rates of health care cost increases may vary significantly from the assumption used because of unanticipated changes in health care costs.

Components of Accumulated Other

Components of Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Components of Accumulated Other Comprehensive Loss	NOTE 17. COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE LOSS The following tables detail the changes in our Accumulated Other Comprehensive Loss Consolidated Balance Sheets (in thousands) 2020 2019 Pension Plans Balance at beginning of period $ 117,028 $ 129,253 Net loss (gain) arising during the period 5,306 (2,081 ) Effect of pension settlement (31,811 ) — Amounts reclassified from AOCL to earnings (11,498 ) (10,144 ) Balance at end of period 79,025 117,028 Other Postretirement Benefit Plans Balance at beginning of period 10,331 (1,382 ) Net loss arising during the period 4,747 5,917 Amounts reclassified from AOCL to earnings (295 ) 5,796 Balance at end of period 14,783 10,331 Cash Flow Hedges Balance at beginning of period 20,000 1,560 Net loss arising during the period 14,632 19,824 Amounts reclassified from AOCL to earnings (7,451 ) (1,384 ) Balance at end of period 27,181 20,000 Accumulated other comprehensive loss, end of period $ 120,989 $ 147,359 See Note 11: Derivative Instruments Note 16: Savings Plans, Pension and Other Postretirement Employee Benefits

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
General	GENERAL PotlatchDeltic Corporation and its subsidiaries (collectively referred to in this report as the company, us, we or our) is a leading timberland Real Estate Investment Trust (REIT) with operations in seven states. We are engaged in activities associated with timberland management, including the sale of timber, the management of approximately 1.8 million acres of timberlands and the purchase and sale of timberlands. We are also engaged in the manufacture and sale of wood products and the development of real estate. Our timberlands, real estate development projects and all of our wood products facilities are located within the continental United States. The primary market for our products is the United States. We converted to a REIT effective January 1, 2006. As described in Note 2: Mergers and Divestitures
Consolidation	CONSOLIDATION The Consolidated Financial Statements
Use of Estimates	USE OF ESTIMATES The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, which we refer to in this report as GAAP, requires management to make estimates and judgments affecting the amounts reported in the financial statements and the accompanying notes. The inputs into our judgments and estimates consider the economic implications of COVID-19 on our critical and significant accounting estimates. The actual results that we experience may differ materially from our estimates.
Cash and Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash Cash equivalents are investments that are highly liquid with original maturities of three months or less when purchased. The following provides a reconciliation of cash, cash equivalents, and restricted cash at December 31: Years Ended December 31, (in thousands) 2020 2019 2018 Cash and cash equivalents $ 252,340 $ 83,310 $ 76,639 Restricted cash included in other long-term assets 1 — 944 2,802 Total cash, cash equivalents, and restricted cash $ 252,340 $ 84,254 $ 79,441 1 . The following present supplemental disclosures to the Consolidated Statements of Cash Flows Years Ended December 31, (in thousands) 2020 2019 2018 NONCASH INVESTING AND FINANCING ACTIVITIES Long-term debt assumed by buyer in sale of facility $ — $ 29,000 $ — Accrued property, plant and equipment additions $ 1,142 $ 1,396 $ 339 Accrued timberlands reforestation and roads $ 697 $ 352 $ 199 Equity issued as consideration for our merger with Deltic $ — $ — $ 1,142,775 Earnings and profits distribution $ — $ — $ 177,565 CASH FLOW INFORMATION Cash paid during the year for: Interest, net of amounts capitalized $ 28,518 $ 32,282 $ 34,490 Income taxes, net $ 25,790 $ 7,148 $ 10,800
Business Combinations	BUSINESS COMBINATIONS We recognize identifiable assets acquired and liabilities assumed at their acquisition date estimated fair value. Goodwill, if any, as of the acquisition date is measured as the excess of consideration transferred over the net of the acquisition date estimated fair value of the assets acquired and the liabilities assumed. While we use our best estimates and assumptions for the purchase price allocation process to value assets acquired and liabilities assumed at the acquisition date, our estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, we record adjustments to the assets acquired and liabilities assumed to the extent that we identify adjustments to the preliminary purchase price allocation. We recognize measurement period adjustments and any resulting effect on earnings during the period in which the adjustment is identified. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to our Consolidated Statements of Operations
Revenue Recognition	REVENUE RECOGNITION We recognize revenue in accordance with the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic No. 606, Revenue from Contracts with Customers For our Timberlands segment we generate revenue predominantly in the form of delivered logs, pay-as-cut stumpage contracts, lump sum stumpage contracts and timber deeds. For our Wood Products segment we generate revenue from the sale of manufactured wood products and residual by-products. For our Real Estate segment, we generate revenue from the sale of rural real property deemed non-strategic or identified as having higher and better use alternatives and real estate development and subdivision activity. Performance Obligations A performance obligation, as defined in ASC 606, is a promise in a contract to transfer a distinct good or service to a customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue at the point in time, or over the period in which the performance obligation is satisfied. Performance obligations associated with delivered logs sales are typically recognized at the point the logs are delivered and scaled at our customers’ mills. Revenue is recognized on timber deeds and lump sum stumpage contracts generally upon closing or when the contracts are effective, which is the point at which the buyer assumes risk of loss associated with the standing timber. We enter into pay-as-cut contracts with customers that provide the customer with the right of access to harvest timber on a specified area of our land. At the execution of the agreement, the customer typically does not take title, control or risk of ownership to the timber. Revenue for pay-as-cut contracts is recognized once scaling occurs as that is the point when control of the harvested trees has transferred to the customer and we have a right to payment. Performance obligations associated with the sale of wood products are typically satisfied when the products are shipped (FOB shipping point) or upon delivery to our customer (FOB destination) depending on the terms of the customer contract. Shipping and handling costs for all wood products, log hauling costs and residual sales are accounted for as cost of goods sold in our Consolidated Statements of Operations . We also enter into vendor managed inventory (VMI) programs with certain customers whereby inventory is shipped to a VMI loc ation. For products shipped under VMI arrangements, revenue is recognized and billed when control transfers to the customer and we have no further obligations, which is generally once the customer pulls the inventory from the VMI warehouse. Performance obligations associated with real estate sales are generally satisfied at a point in time when all conditions of closing have been met and title transfers to the buyer. ASC 606 requires entities to consider significant financing components of contracts with customers, though allows for the use of a practical expedient when the period between satisfaction of a performance obligation and payment receipt is one year or less. Given the nature of our revenue transactions, we have elected to utilize this practical expedient. Contract Estimates There are no significant contract estimates as substantially all of our performance obligations are satisfied as of a point in time. The transaction price for log sales includes amounts billed for logging and hauling and generally equals the amount billed to our customer for logs delivered during the accounting period. For the limited number of log sales subject to a long-term supply agreement, the transaction price is variable but is known at the time of billing. For wood products sales, the transaction price is typically the amount billed to the customer for the products shipped but may be reduced slightly for estimated cash discounts and rebates. In general, a customer receivable is recorded as we deliver wood products, logs and residuals. We generally receive payment shortly after products have been received by our customers. For real estate sales we typically receive the entire consideration in cash at closing. At December 31, 2020 and 2019, the allowance for credit losses associated with our customer receivables was insignificant. See Note 3 Segment Information
Inventories	INVENTORIES For most of our operations, we use the last-in, first-out (LIFO) method of valuing log, lumber and plywood inventory. An actual valuation of inventory under the LIFO method occurs only at the end of each year based on the inventory levels and costs at that time. Interim LIFO calculations are based on management’s best estimates of expected year-end inventory levels and costs and are subject to the final year-end LIFO inventory valuation. Inventories valued under LIFO are stated at the lower of cost or market. All segment inventories are reported using the average cost method. The LIFO reserve and intersegment eliminations are recorded at the corporate level. Inventories not valued under LIFO are recorded at the lower of average cost or net realizable value. Expenses associated with idle capacity or abnormally low production are reflected in cost of goods sold in the periods incurred. See Note 5: Inventories
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are valued at cost less accumulated depreciation. Depreciation of buildings, equipment and other depreciable assets is determined using the straight-line method of depreciation. Major improvements and replacements of property are capitalized. Maintenance, repairs and minor improvements and replacements are expensed. Upon retirement or other disposition of property, applicable cost and accumulated depreciation are removed from the accounts. Any gains or losses are included in operating income. See Note 6: Property, Plant and Equipment
Recovery of Long-Lived Assets	RECOVERY OF LONG-LIVED ASSETS Our long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. We evaluate recoverability of an asset group by comparing its carrying value to the future net undiscounted cash flows that we expect will be generated by the asset group. If the comparison indicates that the carrying value of an asset group is not recoverable, we recognize an impairment loss for the excess of carrying value over the estimated fair value. When we recognize an impairment loss for assets to be held and used, we depreciate the adjusted carrying amount of those assets over their estimated remaining useful life. We also perform a test for recoverability when management has committed to a plan to sell or otherwise dispose of an asset group. Assets to be disposed of are reported at the lower of carrying amount or fair value less cost to sell. There were no events or changes in circumstances that indicated the carrying amounts of our long-lived held and used assets were not recoverable during the years ended December 31, 20 20 , 201 9 or 201 8 . For the years ended December 31, 20 20 , 201 9 and 201 8 we recorded loss es on disposal of property, plant and equipment of approximately $ 0 , $ million and $ million, respectively.
Timber and Timberlands	TIMBER AND TIMBERLANDS Timber and timberlands are valued at cost less accumulated depletion and amortization. We capitalize costs related to stand establishment, which include the preparation of the land for planting, seeds or seedlings and tree planting costs, which include third-party labor costs, materials and other contract services. Upon completion of planting activities and field inspection to confirm the planting operation was successful, a plantation is considered “established.” Subsequent expenditures to maintain the integrity or enhance the growth of an established plantation or stand are expensed. Post-establishment expenses include vegetation control, fertilization, thinning operations and the replanting of seedlings lost through mortality. Forest management costs are considered current operating expenses and include property taxes and insurance, silviculture costs incurred subsequent to stand establishment, cruising of timber volume, property maintenance, salaries, supplies, travel, record-keeping, fire protection and other normal recurring administrative personnel costs. Timberland acquisitions are capitalized based on the relative appraised values of timberland, merchantable timber, pre-production timber (young growth that is not yet merchantable timber), logging roads and other land improvements. The estimated volume of current standing merchantable timber, which is a component of calculating our depletion rates, is updated at least annually to reflect increases due to the reclassification of pre-production timber to merchantable timber when it meets defined diameter specifications, the annual growth of merchantable timber and the acquisition of additional merchantable timber, decreases due to timber harvests and land sales and changes resulting from other factors, such as casualty losses. Timber volumes are estimated from cruises of the timber tracts, which are completed on our timberlands on approximately a five to ten year cycle. Depletion represents the amount charged to expense as timber is harvested. Rates at which timber is depleted are calculated annually for each of our depletion pools by dividing the beginning of year balance of the merchantable timber accounts by the volume of standing merchantable timber, after estimated timber volume updates. The base cost of logging roads, such as clearing, grading and ditching, is not amortized and remains a capitalized item until disposition. Other portions of the initial logging road cost, such as bridges, culverts and gravel surfacing are amortized over their useful lives, which range from 5 to 20 years. Costs associated with temporary logging road spurs, which are typically used for one harvest season, are expensed as incurred. See Note 7: Timber and Timberlands
Intangible Assets	INTANGIBLE ASSETS We recorded intangible assets in connection with the Deltic merger in 2018. We have both indefinite-lived and long-lived intangible assets. Long-lived intangible assets include customer relationships and certain trade names we estimate have a finite life and are being amortized over 10 and 20 years, respectively, and are evaluated for impairment under our Recovery of Long-Lived Assets policy described above. At December 31, 2020 and 2019 the gross carrying amount of our long-lived intangible assets were $8.4 million and accumulated amortization was $2.3 million and $1.5 million, respectively. Amortization expense totaled $0.8 million in 2020, 2019 and 2018 and is estimated to be $0.8 million annually for the next five years. Our i ndefinite - lived intangible assets were $ 10.2 million at December 31, 2020 and 2019 and are not amortized . Rather, they are tested for potential impairments annually as of October 1, or during the year if an event or other circumstance indicates that we may not be able to recover the carrying amount of the assets. We did not impair any intangible assets during the years ended December 31, 2020, 2019 or 2018.
Company Owned Life Insurance	COMPANY OWNED LIFE INSURANCE We are the beneficiary of insurance policies on the lives of certain past officers and employees. We have recognized the amount that could be realized upon surrender of the insurance policies in other assets in our Consolidated Balance Sheets Consolidated Statements of Operations Consolidated Statements of Cash Flows .
Derivative Instruments	DERIVATIVE INSTRUMENTS We use, from time to time, certain derivative instruments to mitigate exposure to volatility in interest rates and effectively convert a portion of floating rate debt to a fixed rate basis, thus reducing the impact of interest rate changes on future interest expense and cash flows. All derivatives, whether designated as a hedging relationship or not, are recorded in the Consolidated Balance Sheets For a cash flow hedge, the fair value of the effective portion of the derivative is recognized as an asset or liability with a corresponding amount in Accumulated Other Comprehensive Loss Consolidated Balance Sheets . Accumulated Other Comprehensive Loss If a hedge ceases to qualify for hedge accounting, the contract would continue to be carried on the balance sheet at fair value until settled and adjustments to the contract’s fair value would be recognized in earnings. If a forecasted transaction were no longer probable of occurring, amounts previously deferred in Accumulated Other Comprehensive Loss We have International Swap Dealers Association ("ISDA") Master Agreements with each counterparty that permits the net settlement of amounts owed under the respective contracts. The ISDA Master Agreement is an industry standardized contract that governs all derivative contracts entered into between the company and the respective counterparty. Under these master netting agreements, net settlement generally permits the company or the counterparty to determine the net amount payable or receivable for contracts due on the same date for similar types of derivative transactions. We have not elected to offset the fair value positions of the derivative contracts recorded in the Consolidated Balance Sheets Note: 11 Derivative Instruments
Fair Value Measurements	FAIR VALUE MEASUREMENTS We use a fair value hierarchy in accounting for certain nonfinancial assets and liabilities including long-lived assets (asset groups) measured at fair value for an impairment assessment and pension plan assets measured at fair value. The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions. The fair value hierarchy consists of the following three levels: • Level 1: Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets. • Level 2: Inputs are quoted prices in non-active markets for which pricing inputs are observable either directly or indirectly at the reporting date. • Level 3: Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are observed. See Note: 12 Fair Value Measurements
Equity-Based Compensation	EQUITY-BASED COMPENSATION Equity-based awards are measured at estimated fair value on the dates they are granted or modified. These measurements establish the cost of the equity-based awards for accounting purposes. Equity-based compensation expense is recognized over the awards’ applicable vesting period using the straight-line method. The impact of stock award forfeitures on compensation expense is recognized at the time of forfeit as no estimate of future stock award forfeitures is considered in our calculation of equity-based compensation expense. See Note 13: Equity-Based Compensation Plans
Leases	LEASES We lease certain equipment, office space and land. Right-of-use (ROU) assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating and finance lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate in determining the present value of lease payments. We consider our recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating our incremental borrowing rates. Most leases include one or more options to renew, with renewal terms that can extend the lease term between one to five years. The exercise of lease renewal options is at our sole discretion. Under the operating lease model, lease expense is recognized on a straight-line basis over the lease term. Under the finance lease model, lease expense consists of the amortization of the ROU asset on a straight-line basis over the asset’s estimated useful life and interest expense calculated using the effective interest method. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Certain of our rental payments are adjusted periodically for inflation. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants and we do not have any significant sublease income. See Note 14: Leases
Income Taxes	INCOME TAXES We use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases, operating loss carryforwards and tax credit carryforwards. Deferred tax assets and liabilities are measured pursuant to tax laws using rates expected to apply to taxable income in the years in which the temporary differences are expected to be recovered or settled. We recognize the effect of a change in income tax rates on deferred tax assets and liabilities in the Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income in the period that includes the enactment date of the rate change. We record a valuation allowance to reduce the carrying amounts of deferred tax assets if it is more likely than not that such deferred tax assets will not be realized. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities. The determination is based on the technical merits of the position and presumes that each uncertain tax position will be examined by the relevant taxing authority that has full knowledge of all relevant information. See Note 15: Income Taxes
Pension and Other Postretirement Benefits	PENSION AND OTHER POSTRETIREMENT BENEFITS We recognize any overfunded or underfunded status of our defined benefit pension and other postretirement plans on our Consolidated Balance Sheets • costs of benefits provided in exchange for employees’ services rendered; • interest cost of the obligation; • expected long-term return on plan assets for funded plans; • amortization of prior service costs and plan amendments over the average remaining service period of the active employee group covered by the plan; and • amortization of cumulative unrecognized net actuarial gains and losses – generally in excess of 10 percent of the greater of the benefit obligation or market-related value of plan assets at the beginning of the year – over the average remaining service period of the active employee group covered by the plan. Different assumptions would change the net periodic pension and postretirement benefit costs and the obligation of the benefit plans. See Note 16: Savings Plans, Pension Plans and Other Postretirement Employee Benefits
Commitments, Contingencies and Legal Matters	COMMITMENTS, CONTINGENCIES AND LEGAL MATTERS We accrue estimates for resolution of any legal and other contingencies when losses are probable and estimable, in accordance with ASC 450, Contingencies. At any given time, we are subject to claims and actions incidental to the operations of our business. Based on information currently available, we do not expect that any sums we may receive or have to pay in connection with any legal proceeding would have a materially adverse effect on our consolidated financial position, operating results or net cash flow.
New Accounting Pronouncements	NEW ACCOUNTING PRONOUNCEMENTS New Accounting Standards Adopted in 2020 In August 2018, the FASB issued ASU No. 2018-15 Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract Consolidated Financial Statements In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Topic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement New Accounting Standards Not Yet Adopted In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting Consolidated Financial Statements

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Reconciliation of Cash, Cash Equivalents, and Restricted Cash	The following provides a reconciliation of cash, cash equivalents, and restricted cash at December 31: Years Ended December 31, (in thousands) 2020 2019 2018 Cash and cash equivalents $ 252,340 $ 83,310 $ 76,639 Restricted cash included in other long-term assets 1 — 944 2,802 Total cash, cash equivalents, and restricted cash $ 252,340 $ 84,254 $ 79,441 1 .
Supplemental Disclosures to Consolidated Statements of Cash Flows	The following present supplemental disclosures to the Consolidated Statements of Cash Flows Years Ended December 31, (in thousands) 2020 2019 2018 NONCASH INVESTING AND FINANCING ACTIVITIES Long-term debt assumed by buyer in sale of facility $ — $ 29,000 $ — Accrued property, plant and equipment additions $ 1,142 $ 1,396 $ 339 Accrued timberlands reforestation and roads $ 697 $ 352 $ 199 Equity issued as consideration for our merger with Deltic $ — $ — $ 1,142,775 Earnings and profits distribution $ — $ — $ 177,565 CASH FLOW INFORMATION Cash paid during the year for: Interest, net of amounts capitalized $ 28,518 $ 32,282 $ 34,490 Income taxes, net $ 25,790 $ 7,148 $ 10,800

Mergers and Divestitures (Table

Mergers and Divestitures (Tables)	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Summary of Unaudited Pro Forma Information	The following summarizes unaudited pro forma information that presents combined amounts as if the merger occurred at the beginning of 2017: Year Ended December 31, (in thousands, except per share amounts) 2018 Net sales $ 1,013,242 Net earnings attributable to PotlatchDeltic common shareholders $ 145,685 Basic earnings per share attributable to PotlatchDeltic common shareholders $ 2.16 Diluted earnings per share attributable to PotlatchDeltic common shareholders $ 2.15

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Summary of Revenues by Major Product	The following table represents our revenues by major product: Year Ended December 31, (in thousands) 2020 2019 2018 Timberlands Northern region Sawlogs $ 213,030 $ 161,570 $ 205,977 Pulpwood 4,502 5,767 5,996 Stumpage 316 109 176 Other 1,581 1,970 1,801 Total Northern revenues 219,429 169,416 213,950 Southern region Sawlogs 93,828 88,048 81,460 Pulpwood 49,084 53,315 48,585 Stumpage 4,077 1,666 2,434 Other 10,101 10,248 8,521 Total Southern revenues 157,090 153,277 141,000 Total Timberlands revenues 376,519 322,693 354,950 Wood Products Lumber 573,069 396,648 464,180 Residuals and Panels 125,336 143,760 216,751 Total Wood Products revenues 698,405 540,408 680,931 Real Estate Rural real estate 81,979 49,675 36,024 Development real estate 14,979 22,363 12,852 Other 7,458 6,834 5,690 Total Real Estate revenues 104,416 78,872 54,566 Total segment revenues 1,179,340 941,973 1,090,447 Intersegment Timberlands revenues 1 (138,410 ) (114,875 ) (115,868 ) Total consolidated revenues $ 1,040,930 $ 827,098 $ 974,579 1 Intersegment revenues represent logs sold by our Timberlands segment to the Wood Products segment.
Summary of Information by Business Segment	The following table summarizes information for each of the company’s reportable segments and includes a reconciliation of Total Adjusted EBITDDA to income before income taxes. Corporate information is included to reconcile segment data to the Consolidated Financial Statements Year Ended December 31, (in thousands) 2020 2019 2018 Adjusted EBITDDA: Timberlands $ 182,802 $ 133,987 $ 169,834 Wood Products 176,095 12,901 130,583 Real Estate 86,476 62,650 40,304 Corporate (48,451 ) (36,257 ) (37,785 ) Eliminations and adjustments (14,694 ) 5,662 (5,743 ) Total Adjusted EBITDDA 382,228 178,943 297,193 Interest expense, net 1 (29,463 ) (30,361 ) (35,227 ) Depreciation, depletion and amortization (76,261 ) (70,417 ) (70,848 ) Basis of real estate sold (25,348 ) (20,554 ) (16,698 ) Loss on extinguishment of debt — (5,512 ) — Pension settlement charge (42,988 ) — — Non-operating pension and other postretirement employee benefits (14,226 ) (3,739 ) (7,648 ) Gain (loss) on fixed assets 11 (865 ) (725 ) Gain on sale of facility — 9,176 — Inventory purchase price adjustment in cost of goods sold 2 — — (1,849 ) Deltic merger-related costs 3 — — (22,119 ) Income before income taxes $ 193,953 $ 56,671 $ 142,079 1 Includes amortization of bond discounts and deferred loan fees. 2 The effect of costs of goods sold for fair value adjustments to the carrying amounts of inventory acquired in business combinations. See Note 2: Mergers and Divestitures. 3 See Note 2: Mergers and Divestitures. The following table summarizes additional reportable segment financial information: Year Ended December 31, (in thousands) 2020 2019 2018 Depreciation, depletion and amortization: Timberlands $ 51,047 $ 46,601 $ 48,201 Wood Products 23,611 22,059 21,416 Real Estate 620 678 418 Corporate 983 1,079 813 76,261 70,417 70,848 Bond discount and deferred loan fees 1 1,624 1,688 2,313 Total depreciation, depletion and amortization $ 77,885 $ 72,105 $ 73,161 Basis of real estate sold: Real Estate $ 25,990 $ 20,749 $ 16,954 Elimination and adjustments (642 ) (195 ) (256 ) Total basis of real estate sold $ 25,348 $ 20,554 $ 16,698 Assets: Timberlands 2 1,617,809 1,655,407 1,693,162 Wood Products 421,066 398,465 456,306 Real Estate 3 89,509 87,421 93,208 2,128,384 2,141,293 2,242,676 Corporate 252,681 93,766 83,176 Total consolidated assets $ 2,381,065 $ 2,235,059 $ 2,325,852 Capital Expenditures: 4 Timberlands $ 16,252 $ 17,500 $ 17,232 Wood Products 21,565 37,232 27,341 Real Estate 5 7,088 8,053 5,987 44,905 62,785 50,560 Corporate 728 1,317 1,747 Total capital expenditures $ 45,633 $ 64,102 $ 52,307 1 Included within interest expense on the Consolidated Statements of Operations. 2 We do not report rural real estate separate from Timberlands as we do not report these assets separately to management. 3 Real Estate assets primarily consist of the master planned community development and a country club, both located in Arkansas. 4 Does not include the acquisition of timber and timberlands, all of which were acquired by the Timberlands segment. 5 Real Estate capital expenditures include development expenditures of $6.7 million, $7.3 million and $5.0 million for the years ended December 31, 2020, 2019 and 2018, respectively.

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Reconciliation of Number of Shares Used in Calculating Basic and Diluted Earnings per Share	The following table reconciles the number of shares used in calculating basic and diluted earnings per share for the years ended December 31: (in thousands) 2020 2019 2018 Basic weighted-average shares outstanding 67,237 67,608 60,534 Incremental shares due to: Performance shares 289 109 230 Restricted stock units 42 26 34 Stock portion of earnings and profits distribution — — 1,016 Diluted weighted-average shares outstanding 67,568 67,743 61,814

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following at December 31: (in thousands) 2020 2019 Logs $ 31,210 $ 33,313 Lumber, plywood and veneer 34,136 31,639 Materials and supplies 14,939 12,831 80,285 77,783 Less: LIFO reserve (18,249 ) (12,002 ) Total inventories $ 62,036 $ 65,781

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, Plant and Equipment consist of the following at December 31: (in thousands) Range of useful lives 2020 2019 Land $ 7,333 $ 7,875 Buildings and improvements 10-40 years 126,576 123,342 Machinery and equipment 2-25 years 377,782 360,570 Construction in progress 6,020 6,326 517,711 498,113 Less: accumulated depreciation (229,167 ) (211,730 ) Total property, plant and equipment, net $ 288,544 $ 286,383

Timber and Timberlands (Tables)

Timber and Timberlands (Tables)	12 Months Ended
	Dec. 31, 2020
Timber And Timberlands [Abstract]
Schedule of Timber and Timberlands	Timber and Timberlands consist of the following at December 31: (in thousands) 2020 2019 Timber and timberlands $ 1,516,788 $ 1,554,882 Logging roads 83,273 83,781 Total timber and timberlands, net $ 1,600,061 $ 1,638,663

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Other Assets [Abstract]
Schedule of Other Current Assets	Other Current Assets consist of the following at December 31: (in thousands) 2020 2019 Real estate held for sale $ 8,818 $ 10,974 Prepaid expenses 4,032 3,097 Tax receivables — 1,341 Other 3,286 4,771 Total other current assets $ 16,136 $ 20,183
Schedule of Other Long-term Assets	Other Long-Term Assets consist of the following at December 31: (in thousands) 2020 2019 Interest rate swaps $ 18,466 $ 1,601 Operating leases 11,081 15,772 Mineral rights 4,825 5,254 Investment in company owned life insurance (COLI), net 3,328 4,157 Real estate development costs 3,748 3,776 Debt issuance costs 1,288 1,846 Restricted cash — 944 Other 3,981 1,940 Total other long-term assets $ 46,717 $ 35,290

Accounts Payable and Accrued _2

Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Accounts Payable And Accrued Liabilities Current And Noncurrent [Abstract]
Schedule of Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities consist of the following at December 31: (in thousands) 2020 2019 Accrued payroll and benefits $ 29,675 $ 12,920 Accounts payable 9,724 12,734 Accrued interest 6,485 6,946 Accrued taxes 20,780 6,638 Deferred revenue 1 8,789 5,514 Operating lease liabilities 4,304 4,998 Other current liabilities 13,522 10,827 Total accounts payable and accrued liabilities $ 93,279 $ 60,577 1

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consists of the following at December 31: (in thousands) 2020 2019 Variable rate term loans 1 $ 403,500 $ 397,500 Fixed rate term loans 2 290,000 296,000 Revenue bonds 3 65,735 65,735 Medium-term notes 4 3,000 3,000 Long-term principal 762,235 762,235 Debt issuance costs (1,857 ) (2,086 ) Unamortized discounts (3,031 ) (3,680 ) Total long-term debt 757,347 756,469 Less: current portion of long-term debt (39,981 ) (45,974 ) Long-term debt $ 717,366 $ 710,495 1 Variable rate term loans are at rates of one or three-month LIBOR plus a spread between 1.85% and 2.15% and mature between 2021 and 2030. At December 31, 2020, the one and three-month LIBOR rates were 0.16% and 0.23%, respectively. We have entered into interest rate swaps for these variable rate term loans to fix the interest rate. See Note 11: Derivative Instruments 2 Fixed rate term loans are at rates between 4.05% and 4.64% and mature between 2022 and 2025. 3 Revenue bonds have a fixed rate of 2.75% and mature in 2024. 4 Medium term notes have a fixed rate of 8.75% and mature in 2022 .
Schedule of Maturities of Long-term Debt	Scheduled principal payments due on long-term debt at December 31, 2020 are as follows: (in thousands) 2021 $ 40,000 2022 43,000 2023 40,000 2024 175,735 2025 100,000 Thereafter 363,500 Total $ 762,235

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instrument Detail [Abstract]
Fair Value of Cash Flow Derivative Instruments	The fair values of our cash flow derivative instruments on our Consolidated Balance Sheets Asset Derivatives Liability Derivatives (in thousands) Location 2020 2019 Location 2020 2019 Derivatives designated in cash flow hedging relationships: Interest rate contracts Other assets, current $ 63 $ — Accounts payable and accrued liabilities $ 1,010 $ — Interest rate contracts Other assets, non-current $ 18,466 $ 1,601 Other long-term obligations $ 45,100 $ 22,398
Effect of Derivatives on Consolidated Statements of Operations	The following table details the effect of derivatives on our Consolidated Statements of Operations Year Ended December 31, (in thousands) Location 2020 2019 2018 Derivatives designated in cash flow hedging relationships: Interest rate contracts Loss recognized in other comprehensive income, net of tax $ (14,632 ) $ (19,824 ) $ (3,062 ) Loss reclassified from accumulated other comprehensive loss, net of tax 1 Interest expense $ (7,451 ) $ (1,384 ) $ (647 ) Interest expense, net $ 29,463 $ 30,361 $ 35,227 1 Realized gains and losses on interest rate contracts consist of net cash received or paid and interest accruals on the interest rate swaps during the periods. Net cash received or paid is included in the supplemental cash flow information within interest, net of amounts capitalized in the Consolidated Statements of Cash Flows .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instrument Detail [Abstract]
Carrying Amounts and Estimated Fair Value of Financial Instruments	Carrying amounts and estimated fair values of our financial instruments as of December 31 are as follows: 2020 2019 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Derivative assets related to interest rate swaps (Level 2) $ 18,529 $ 18,529 $ 1,601 $ 1,601 Derivative liabilities related to interest rate swaps (Level 2) $ (46,110 ) $ (46,110 ) $ (22,398 ) $ (22,398 ) Long-term debt, including current portion (Level 2): Term loans $ (690,469 ) $ (716,631 ) $ (689,820 ) $ (703,437 ) Revenue bonds (65,735 ) (67,885 ) (65,735 ) (68,200 ) Medium-term notes (3,000 ) (3,545 ) (3,000 ) (3,480 ) Total long-term debt 1 $ (759,204 ) $ (788,061 ) $ (758,555 ) $ (775,117 ) Company owned life insurance (Level 3) $ 3,328 $ 3,328 $ 4,157 $ 4,157 1

Equity-Based Compensation Pla_2

Equity-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Share Based Compensation [Abstract]
Details of Equity-Based Compensation Expense and Related Income Tax Benefit	The following table details our compensation expense and the related income tax benefit for the years ended December 31: (in thousands) 2020 2019 2018 Employee equity-based compensation expense: Performance stock awards $ 5,083 $ 4,605 $ 4,157 Restricted stock units 2,904 2,595 2,024 Deferred compensation stock equivalent units expense 76 72 213 Accelerated share-based termination benefits in connection with the merger — — 1,812 Total equity-based compensation expense $ 8,063 $ 7,272 $ 8,206 Total tax benefit recognized for shared-based payment awards $ 357 $ 314 $ 332
Fair Value of Performance Share Awards	The following table presents the key inputs used in calculating the fair value of the PSAs and the resulting fair values: Year Ended December 31, 2020 2019 2018 Stock price as of valuation date $ 42.16 $ 35.01 $ 54.00 Risk-free rate 1.42 % 2.47 % 2.46 % Expected volatility 25.74 % 25.15 % 23.74 % Expected dividend yield 1 — — 2.96 % Expected term (years) 3.00 3.00 3.00 Fair value of a performance share $ 45.04 $ 37.87 $ 75.37 1
Summary of Outstanding Performance Share Awards	The following table summarizes outstanding PSAs as of December 31 and the changes during each year: 2020 2019 2018 (in thousands, except per share amounts) Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Nonvested shares outstanding at January 1 196,007 $ 50.15 142,238 $ 63.91 200,631 $ 39.19 Granted 125,001 $ 45.04 142,066 $ 37.87 67,747 $ 75.37 Vested (63,456 ) $ 75.37 (75,048 ) $ 53.85 (121,058 ) $ 30.02 Forfeited (4,286 ) $ 47.07 (13,249 ) $ 45.35 (5,082 ) $ 47.90 Nonvested shares outstanding at December 31 253,266 $ 41.36 196,007 $ 50.15 142,238 $ 63.91 Total grant date fair value of PSAs vested during the year $ 4,783 $ 4,041 $ 3,634 Total fair value of PSAs vested during the year $ 3,968 $ 3,561 $ 6,397 Aggregate intrinsic value of nonvested PSAs at December 31 $ 12,668 $ 8,481 $ 4,500
Summary of Outstanding RSU Awards	The following table summarizes outstanding RSU awards as of December 31 and the changes during each year: 2020 2019 2018 (in thousands, except per share amounts) Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Nonvested shares outstanding at January 1 127,471 $ 39.83 72,020 $ 47.66 67,871 $ 32.87 Granted 68,263 $ 38.77 104,488 $ 36.80 49,193 $ 49.96 Vested (52,908 ) $ 44.48 (43,102 ) $ 45.51 (41,350 ) $ 26.33 Forfeited (3,334 ) $ 40.20 (5,935 ) $ 40.26 (3,694 ) $ 45.36 Nonvested shares outstanding at December 31 139,492 $ 37.54 127,471 $ 39.83 72,020 $ 47.66 Total grant date fair value of RSU awards vested during the year $ 2,354 $ 1,961 $ 1,089 Total fair value of RSU awards vested during the year $ 2,196 $ 1,771 $ 1,328 Aggregate intrinsic value of nonvested RSU awards at December 31 $ 6,977 $ 5,516 $ 2,279

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of Supplemental Balance Sheet Information Related Leases	Balance Sheet Classification The following tables provide supplemental balance sheet information related to our leases as of December 31: (in thousands) Classification 2020 2019 Assets Operating lease assets Other long-term assets $ 11,081 $ 15,772 Finance lease assets 1 Property, plant and equipment, net 7,206 2,360 Total lease assets $ 18,287 $ 18,132 Liabilities Current Operating lease liabilities Accounts payable and accrued liabilities $ 4,304 $ 4,998 Finance lease liabilities Accounts payable and accrued liabilities 2,202 644 Noncurrent Operating lease liabilities Other long-term obligations 6,835 10,775 Finance lease liabilities Other long-term obligations 4,914 1,703 Total lease liabilities $ 18,255 $ 18,120 1 Finance lease assets are presented net of accumulated amortization of $1.7 million and $0.3 million as of December 31, 2020 and 2019, respectively.
Schedule of Weighted Average Remaining Terms and Discount Rate	2020 2019 Weighted-average remaining terms (years) Operating leases 3.80 4.22 Finance leases 3.59 3.83 Weighted-average discount rate Operating leases 4.13 % 4.17 % Finance leases 2.76 % 3.54 %
Schedule of Components of Lease Expense	Lease Costs The following table summarizes the components of our lease expense as of December 31: Year Ended December 31, (in thousands) 2020 2019 2018 Operating lease costs 1 $ 5,640 $ 5,938 $ 4,989 Finance lease costs: Amortization of leased assets 1,451 269 — Interest on lease assets 153 40 — Net lease costs $ 7,244 $ 6,247 $ 4,989 1 Excludes short-term leases and variable lease costs, which are immaterial.
Schedule of Supplemental Cash Flow Information Related Leases	Other Lease Information The following table presents supplemental cash flow information related to leases as of December 31: (in thousands) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 5,627 $ 5,963 Operating cash flows for finance leases $ 153 $ 40 Financing cash flows for finance leases $ 1,526 $ 283 Leased assets exchanged for new lease liabilities: Operating leases $ 447 $ 7,135 Finance leases $ 6,295 $ 2,630
Schedule of Maturity of Lease Liabilities	Maturity of Lease Liabilities At December 31, 2020, the future minimum lease payment obligations under noncancelable leases were as follows: (in thousands) Operating Leases Finance Leases 2021 $ 4,670 $ 2,369 2022 2,834 2,278 2023 1,879 1,589 2024 986 868 2025 692 276 After 2025 1,000 91 Total lease payments 12,061 7,471 Less: interest 922 355 Present value of lease liabilities $ 11,139 $ 7,116

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of the Income Tax Provision Allocated to Continuing Operations	Income tax expense consists of the following for the years ended December 31: (in thousands) 2020 2019 2018 Current $ 41,733 $ 12,055 $ 7,038 Deferred (14,610 ) (11,082 ) 11,370 Net operating loss carryforwards — 37 791 Income taxes $ 27,123 $ 1,010 $ 19,199
Schedule of Effective Income Tax Rate Reconciliation	Income tax expense differs from the amount computed by applying the statutory federal income tax rate of 21% to income before income taxes due to the following for the years ended December 31: (in thousands, except effective tax rate) 2020 2019 2018 U.S. federal statutory income tax $ 40,730 $ 11,901 $ 29,837 REIT income not subject to federal income tax (16,949 ) (11,285 ) (8,773 ) Pension contribution deducted at higher tax rate — — (5,665 ) Change in valuation allowance (395 ) (395 ) — State income taxes, net of federal income tax 4,458 903 3,712 Permanent book-tax differences (1,315 ) (793 ) (771 ) Other items, net 594 679 859 Income taxes $ 27,123 $ 1,010 $ 19,199 Effective tax rate 14.0 % 1.8 % 13.5 %
Schedule of Deferred Tax Assets and Liabilities	The tax effects of significant temporary differences creating deferred tax assets and liabilities at December 31 were: (in thousands) 2020 2019 Deferred tax assets: Pension and other postretirement employee benefits $ 34,703 $ 32,110 Inventories 552 754 Tax credits 1,519 2,190 Nondeductible accruals 2,005 815 Incentive compensation 971 1,044 Employee benefits 1,323 1,316 Other 1,110 1,296 Total deferred tax assets 42,183 39,525 Valuation allowance — (395 ) Deferred tax assets, net of valuation allowance 42,183 39,130 Deferred tax liabilities: Timber and timberlands, net (354 ) (965 ) Property, plant and equipment, net (52,698 ) (50,901 ) Intangible assets, net (3,656 ) (3,778 ) Real estate development (1,236 ) (1,402 ) Other (1,979 ) (2,249 ) Total deferred tax liabilities (59,923 ) (59,295 ) Deferred tax liabilities, net $ (17,740 ) $ (20,165 )
Summary of Tax Years Subject to Examination by Major Taxing Jurisdictions	The following table summarizes the tax years subject to examination by major taxing jurisdictions: Jurisdiction Years Federal 2017 — 2020 Arkansas 2017 — 2020 Idaho 2017 — 2020 Michigan 2016 — 2020 Minnesota 2016 — 2020
Summary of Reconciliation of Unrecognized Tax Benefits	a reconciliation of the beginning and ending unrecognized tax benefits for the year-ended December 31, 2019: (in thousands) 2019 Balance at January 1 $ 564 Additions for tax positions of prior years — Reduction for tax positions of prior years (564 ) Balance at December 31 $ —

Savings Plans, Pension Plans _2

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2020
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Schedule of Changes in Projected Benefit Obligations	Changes in benefit obligation, plan assets and funded status for our pension and OPEB plans are as follows: Pension Plans OPEB (in thousands) 2020 2019 2020 2019 Benefit obligation at beginning of year $ (474,237 ) $ (427,909 ) $ (46,395 ) $ (40,032 ) Service cost (8,932 ) (7,767 ) (508 ) (371 ) Interest cost (12,263 ) (18,465 ) (1,502 ) (1,588 ) Actuarial loss (38,366 ) (53,446 ) (6,415 ) (7,997 ) Benefits paid 23,614 33,350 3,985 3,593 Plan settlements 101,755 — — — Benefit obligation at end of year $ (408,429 ) $ (474,237 ) $ (50,835 ) $ (46,395 ) Fair value of plan assets at beginning of year $ 398,468 $ 351,285 $ — $ — Actual return on plan assets 46,672 78,448 — — Employer contributions and benefit payments 6,019 2,085 3,985 3,593 Benefits paid (23,614 ) (33,350 ) (3,985 ) (3,593 ) Plan settlements (101,755 ) — — — Fair value of plan assets at end of year $ 325,790 $ 398,468 $ — $ — Amounts recognized in the consolidated balance sheets: Current liabilities $ (2,363 ) $ (2,152 ) $ (4,211 ) $ (4,549 ) Noncurrent assets 1,907 — — — Noncurrent liabilities (82,183 ) (73,617 ) (46,624 ) (41,846 ) Funded status $ (82,639 ) $ (75,769 ) $ (50,835 ) $ (46,395 )
Pension Plans with Projected Benefit Obligations Greater than Plan Assets	Pension plans with projected benefit obligations greater than plan assets at December 31 are as follows: 2020 2019 Projected benefit obligations $ 350,091 $ 474,237 Fair value of plan assets $ 265,546 $ 398,468
Pension Plans with Accumulated Benefit Obligations Greater than Plan Assets	Pension plans with accumulated benefit obligations greater than plan assets at December 31 are as follows: 2020 2019 Accumulated benefit obligations $ 332,012 $ 458,106 Fair value of plan assets $ 265,546 $ 398,468
Long-term Targeted Asset Allocation Ranges	The long-term targeted asset allocation ranges for the pension benefit plans’ asset categories are as follows: Asset Category Allocation Range Global equities 26% - 38% Fixed income securities 44% - 64% Alternatives, which may include equities and fixed income securities 10% - 16% Cash and cash equivalents 0% - 5%
Schedule of Actual Asset Allocations of the Pension Benefit Plans' Assets	The asset allocations of the pension benefit plans’ assets at December 31 by asset category are as follows: Pension Plans Asset Category 2020 2019 Global equities 32 % 32 % Fixed income securities 53 54 Other (includes cash and cash equivalents and alternatives) 15 14 Total 100 % 100 %
Schedule of Allocation of Plan Assets	Assets within our defined benefit pension plans were invested as follows: (in thousands) December 31, 2020 Asset Category Level 1 Level 2 Total Cash and cash equivalents $ 5,571 $ — $ 5,571 Global equity securities 1 104,775 — 104,775 Fixed income securities 2 143,415 29,494 172,909 Alternatives 3 42,535 — 42,535 Total $ 296,296 $ 29,494 $ 325,790 (in thousands) December 31, 2019 Asset Category Level 1 Level 2 Total Cash and cash equivalents $ 6,671 $ — $ 6,671 Global equity securities 1 127,688 — 127,688 Fixed income securities 2 173,464 40,554 214,018 Alternatives 3 50,091 — 50,091 Total $ 357,914 $ 40,554 $ 398,468 1 2 Level 1 assets are investments in a diversified portfolio of fixed income instruments of varying maturities representing corporates, U.S. treasuries, municipals and futures. Level 2 assets are thinly traded investments in a diversified portfolio of fixed income instruments of varying maturities representing mostly corporates securities. Both Level 1 & Level 2 investments track the Bloomberg Barclay’s Long-term Credit Index. 3 Level 1 assets are long-term investment funds which are invested in tangible assets and real asset companies such as, infrastructure, natural resources and timber.
Pre-tax Components of Net Periodic Cost (Benefit)	Pre-tax components of net periodic cost (benefit) recognized in our Consolidated Statements of Operations Pension Plans OPEB (in thousands) 2020 2019 2018 2020 2019 2018 Service cost $ 8,932 $ 7,767 $ 8,454 $ 508 $ 371 $ 341 Interest cost 12,263 18,465 16,992 1,502 1,588 1,482 Expected return on plan assets (15,474 ) (22,190 ) (20,035 ) — — — Amortization of prior service cost (credit) 111 211 186 (1,274 ) (8,844 ) (8,877 ) Amortization of actuarial loss 15,426 13,497 16,589 1,672 1,012 1,311 Net periodic cost (benefit) before pension settlement charge 21,258 17,750 22,186 2,408 (5,873 ) (5,743 ) Pension settlement charge 42,988 — — — — — Net periodic cost (benefit) $ 64,246 $ 17,750 $ 22,186 $ 2,408 $ (5,873 ) $ (5,743 )
Schedule of Accumulated Other Comprehensive Income (Loss)	The amounts recorded in Accumulated Other Comprehensive Loss Consolidated Balance Sheets Pension Plans OPEB (in thousands) 2020 2019 2020 2019 Net loss $ 78,859 $ 116,780 $ 15,947 $ 12,437 Prior service cost (credit) 166 248 (1,164 ) (2,106 ) Total amount unrecognized $ 79,025 $ 117,028 $ 14,783 $ 10,331
Schedule of Expected Future Benefit Payments	Estimated future benefit payments, which reflect expected future service are as follows for the years indicated: (in thousands) Pension Plans OPEB 2021 $ 21,923 $ 4,211 2022 $ 22,386 $ 3,730 2023 $ 22,649 $ 3,556 2024 $ 22,638 $ 3,274 2025 $ 22,519 $ 3,018 2026–2030 $ 110,216 $ 13,300
Weighted Average Assumptions Used to Determine the Benefit Obligation for Non-Deltic and Deltic Plans	The weighted average assumptions used to determine the benefit obligation for non-Deltic plans as of December 31 were: Pension Plans OPEB 2020 2019 2020 2019 Discount rate 2.65 % 3.40 % 2.60 % 3.40 % Rate of salaried compensation increase 3.00 % 3.00 % — — The weighted average assumptions used to determine the benefit obligation for Deltic plans as of December 31 were: Pension Plans OPEB 2020 2019 2020 2019 Discount rate 2.65 % 3.40 % 2.60 % 3.40 % Rate of salaried compensation increase 4.00 % 4.00 % — —
Schedule of Weighted Average Assumptions Used to Determine the Net Periodic Cost (Benefit) for Non-Deltic and Deltic Plans	The weighted average assumptions used for non-Deltic plans to determine the net periodic cost (benefit) for the years ended December 31 were: Pension Plans OPEB 2020 2019 2018 2020 2019 2018 Discount rate 3.40 % 4.40 % 3.85 % 3.40 % 4.40 % 3.65 % Expected return on plan assets 5.75 % 6.25 % 6.25 % — — — Rate of salaried compensation increase 3.00 % 3.00 % 3.00 % — — — The weighted average assumptions used for Deltic plans to determine the net periodic cost (benefit) for the years ended December 31 were: Pension Plans OPEB 2020 2019 2018 2020 2019 2018 Discount rate 3.40 % 4.40 % 4.30 % 3.40 % 4.40 % 4.30 % Expected return on plan assets 5.75 % 6.25 % 6.25 % — — — Rate of salaried compensation increase 4.00 % 4.00 % 4.00 % — — —

Components of Accumulated Oth_2

Components of Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Changes in Accumulated Other Comprehensive Loss	The following tables detail the changes in our Accumulated Other Comprehensive Loss Consolidated Balance Sheets (in thousands) 2020 2019 Pension Plans Balance at beginning of period $ 117,028 $ 129,253 Net loss (gain) arising during the period 5,306 (2,081 ) Effect of pension settlement (31,811 ) — Amounts reclassified from AOCL to earnings (11,498 ) (10,144 ) Balance at end of period 79,025 117,028 Other Postretirement Benefit Plans Balance at beginning of period 10,331 (1,382 ) Net loss arising during the period 4,747 5,917 Amounts reclassified from AOCL to earnings (295 ) 5,796 Balance at end of period 14,783 10,331 Cash Flow Hedges Balance at beginning of period 20,000 1,560 Net loss arising during the period 14,632 19,824 Amounts reclassified from AOCL to earnings (7,451 ) (1,384 ) Balance at end of period 27,181 20,000 Accumulated other comprehensive loss, end of period $ 120,989 $ 147,359

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Narrative) (Details) a in Millions	12 Months Ended
	Dec. 31, 2020USD ($)a	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Principle Accounting Policies [Line Items]
Timber And Timberlands Acres Owned | a	1.8
Loss on disposal of property	$ 0	$ 900,000	$ 700,000
Gross carrying amount of long-lived intangible assets	8,400,000	8,400,000
Accumulated amortization	2,300,000	1,500,000
Amortization expense	800,000	800,000	800,000
Intangible assets estimated amortization expense, year one	800,000
Intangible assets estimated amortization expense, year two	800,000
Intangible assets estimated amortization expense, year three	800,000
Intangible assets estimated amortization expense, year four	800,000
Intangible assets estimated amortization expense, year five	800,000
Indefinite-lived intangible assets	$ 10,200,000	10,200,000
Defined benefit obligation of plan assets description	• amortization of cumulative unrecognized net actuarial gains and losses – generally in excess of 10 percent of the greater of the benefit obligation or market-related value of plan assets at the beginning of the year – over the average remaining service period of the active employee group covered by the plan.
ASU 2018-15 [Member]
Principle Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 1, 2020
Change in accounting principle, accounting standards update, immaterial effect	true
Change in accounting principle, accounting standards update, transition option elected	us-gaap:AccountingStandardsUpdate201815ProspectiveMember
ASU 2018-14 [Member]
Principle Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 1, 2020
Change in accounting principle, accounting standards update, immaterial effect	true
ASU 2018-13 [Member]
Principle Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 1, 2020
Change in accounting principle, accounting standards update, immaterial effect	true
Designated as Hedging Instrument [Member]
Principle Accounting Policies [Line Items]
Derivative fair value	$ 0	$ 0	$ 0
Intangible Assets, Amortization Period [Member] | Customer Relationships [Member]
Principle Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	10 years
Intangible Assets, Amortization Period [Member] | Trade Names [Member]
Principle Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	20 years
Maximum [Member]
Principle Accounting Policies [Line Items]
Business combination measurement period	1 year
Operating leases, options to extend leases term	5 years
Maximum [Member] | Timber and Timberlands [Member]
Principle Accounting Policies [Line Items]
Timber volume estimate, review period	10 years
Property, plant and equipment, useful life	20 years
Minimum [Member]
Principle Accounting Policies [Line Items]
Operating leases, options to extend leases term	1 year
Minimum [Member] | Timber and Timberlands [Member]
Principle Accounting Policies [Line Items]
Timber volume estimate, review period	5 years
Property, plant and equipment, useful life	5 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 252,340	$ 83,310	$ 76,639
Restricted cash included in other long-term assets		$ 944	$ 2,802
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Total cash, cash equivalents, and restricted cash	$ 252,340	$ 84,254	$ 79,441	$ 120,457

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Supplemental Disclosures to Consolidated Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
NONCASH INVESTING AND FINANCING ACTIVITIES
Long-term debt assumed by buyer in sale of facility		$ 29,000
Accrued property, plant and equipment additions	$ 1,142	1,396	$ 339
Accrued timberlands reforestation and roads	697	352	199
Equity issued as consideration for our merger with Deltic			1,142,775
Earnings and profits distribution			177,565
CASH FLOW INFORMATION
Interest, net of amounts capitalized	28,518	32,282	34,490
Income taxes, net	$ 25,790	$ 7,148	$ 10,800

Mergers and Divestitures (Narra

Mergers and Divestitures (Narrative) (Details) $ in Thousands		Feb. 28, 2019USD ($)	Nov. 15, 2018shares	Feb. 20, 2018USD ($)aSawmillshares	Feb. 19, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)shares	Dec. 31, 2020USD ($)
Business Acquisition [Line Items]
Merger-related costs	[1]								$ 22,119
Qualifying terminations, share-based payments									1,812
Revenue							$ 1,040,930	$ 827,098	974,579
Income before taxes							193,953	56,671	142,079
Pre-tax gain on sale of facility								9,176
Total cash proceeds received after working capital adjustments, closing costs and other expenses							1,000	$ 58,793
Roseburg Forest Products Co [Member] | Deltic MDF Facility [Member]
Business Acquisition [Line Items]
Total sale price		$ 92,000
Cash sale price		63,000
Assumption sale price of revenue bonds		29,000
Pre-tax gain on sale of facility		$ 9,200
Total cash proceeds received after working capital adjustments, closing costs and other expenses							$ 1,000			$ 59,800
Deltic [Member]
Business Acquisition [Line Items]
Acres of timberland | a				530,000
Number of sawmills | Sawmill				2
Total assets acquired				$ 1,400,000
Equity consideration transferred				1,100,000
Liabilities assumed				$ 300,000
Merger-related costs									22,100
Merger related costs, professional fees									12,200
Restructuring costs, termination benefits									9,900
Revenue						$ 265,500
Income before taxes						$ 21,600
Non-recurring merger-related costs					$ 5,500				27,600
Number of shares issued upon merger | shares				22,000,000
Deltic [Member] | Special Distribution [Member]
Business Acquisition [Line Items]
Number of shares issued upon merger | shares			4,800,000
Business combination, estimated shares settle in non cash amount of liability | shares							4,800,000
Deltic [Member] | Replacement Restricted Stock Unit Awards [Member]
Business Acquisition [Line Items]
Qualifying terminations, share-based payments									$ 1,800
Qualifying terminations, accelerated shares | shares									35,000
[1]	See Note 2: Mergers and Divestitures.

Mergers and Divestitures (Summa

Mergers and Divestitures (Summary of Unaudited Pro Forma Information) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)$ / shares
Business Combinations [Abstract]
Net sales | $	$ 1,013,242
Net earnings attributable to PotlatchDeltic common shareholders | $	$ 145,685
Basic earnings per share attributable to PotlatchDeltic common shareholders | $ / shares	$ 2.16
Diluted earnings per share attributable to PotlatchDeltic common shareholders | $ / shares	$ 2.15

Segment Information (Narrative)

Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020SegmentCustomer	Dec. 31, 2019Customer	Dec. 31, 2018Customer
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Revenue from Contract with Customer [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration risk, customer | Customer	0	0	0
Concentration risk, percentage	10.00%	10.00%	10.00%

Segment Information (Summary of

Segment Information (Summary of Revenues by Major Product) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenues		$ 1,040,930	$ 827,098	$ 974,579
Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenues		1,179,340	941,973	1,090,447
Intersegment Eliminations [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	(138,410)	(114,875)	(115,868)
Timberlands [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenues		376,519	322,693	354,950
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member]
Disaggregation Of Revenue [Line Items]
Revenues		219,429	169,416	213,950
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member] | Sawlogs [Member]
Disaggregation Of Revenue [Line Items]
Revenues		213,030	161,570	205,977
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member] | Pulpwood [Member]
Disaggregation Of Revenue [Line Items]
Revenues		4,502	5,767	5,996
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member] | Stumpage [Member]
Disaggregation Of Revenue [Line Items]
Revenues		316	109	176
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues		1,581	1,970	1,801
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member]
Disaggregation Of Revenue [Line Items]
Revenues		157,090	153,277	141,000
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member] | Sawlogs [Member]
Disaggregation Of Revenue [Line Items]
Revenues		93,828	88,048	81,460
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member] | Pulpwood [Member]
Disaggregation Of Revenue [Line Items]
Revenues		49,084	53,315	48,585
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member] | Stumpage [Member]
Disaggregation Of Revenue [Line Items]
Revenues		4,077	1,666	2,434
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues		10,101	10,248	8,521
Wood Products [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenues		698,405	540,408	680,931
Wood Products [Member] | Operating Segments [Member] | Lumber [Member]
Disaggregation Of Revenue [Line Items]
Revenues		573,069	396,648	464,180
Wood Products [Member] | Operating Segments [Member] | Residuals and Panels [Member]
Disaggregation Of Revenue [Line Items]
Revenues		125,336	143,760	216,751
Real Estate Segment [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenues		104,416	78,872	54,566
Real Estate Segment [Member] | Operating Segments [Member] | Rural Real Estate [Member]
Disaggregation Of Revenue [Line Items]
Revenues		81,979	49,675	36,024
Real Estate Segment [Member] | Operating Segments [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues		7,458	6,834	5,690
Real Estate Segment [Member] | Operating Segments [Member] | Development Real Estate [Member]
Disaggregation Of Revenue [Line Items]
Revenues		$ 14,979	$ 22,363	$ 12,852
[1]	Intersegment revenues represent logs sold by our Timberlands segment to the Wood Products segment.

Segment Information (Summary _2

Segment Information (Summary of Information by Business Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Adjusted EBITDDA		$ 382,228	$ 178,943	$ 297,193
Interest expense, net	[1]	(29,463)	(30,361)	(35,227)
Depreciation, depletion and amortization		(76,261)	(70,417)	(70,848)
Basis of real estate sold		(25,348)	(20,554)	(16,698)
Loss on extinguishment of debt			(5,512)
Pension settlement charge		(42,988)
Non-operating pension and other postretirement employee benefits		(14,226)	(3,739)	(7,648)
Gain (loss) on fixed assets		11	(865)	(725)
Gain on sale of facility			9,176
Inventory purchase price adjustment in cost of goods sold	[2]			(1,849)
Deltic merger-related costs	[3]			(22,119)
Income before income taxes		193,953	56,671	142,079
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		76,261	70,417	70,848
Operating Segments [Member] | Timberlands [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		182,802	133,987	169,834
Depreciation, depletion and amortization		51,047	46,601	48,201
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		176,095	12,901	130,583
Depreciation, depletion and amortization		23,611	22,059	21,416
Operating Segments [Member] | Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		86,476	62,650	40,304
Depreciation, depletion and amortization		620	678	418
Basis of real estate sold		(25,990)	(20,749)	(16,954)
Corporate [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		(48,451)	(36,257)	(37,785)
Depreciation, depletion and amortization		983	1,079	813
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		(14,694)	5,662	(5,743)
Basis of real estate sold		$ 642	$ 195	$ 256
[1]	Includes amortization of bond discounts and deferred loan fees.
[2]	The effect of costs of goods sold for fair value adjustments to the carrying amounts of inventory acquired in business combinations.
[3]	See Note 2: Mergers and Divestitures.

Segment Information (Summary _3

Segment Information (Summary of Additional Reportable Segment Financial Information) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		$ (76,261)	$ (70,417)	$ (70,848)
Bond discount and deferred loan fees	[1]	1,624	1,688	2,313
Total depreciation, depletion and amortization		77,885	72,105	73,161
Basis of real estate sold		25,348	20,554	16,698
Assets		2,381,065	2,235,059	2,325,852
Capital Expenditures		45,633	64,102	52,307
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		76,261	70,417	70,848
Assets		2,128,384	2,141,293	2,242,676
Capital Expenditures		44,905	62,785	50,560
Operating Segments [Member] | Timberlands [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		51,047	46,601	48,201
Assets	[2]	1,617,809	1,655,407	1,693,162
Capital Expenditures	[3]	16,252	17,500	17,232
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		23,611	22,059	21,416
Assets		421,066	398,465	456,306
Capital Expenditures		21,565	37,232	27,341
Operating Segments [Member] | Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		620	678	418
Basis of real estate sold		25,990	20,749	16,954
Assets	[4]	89,509	87,421	93,208
Capital Expenditures	[5]	7,088	8,053	5,987
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		983	1,079	813
Assets		252,681	93,766	83,176
Capital Expenditures		728	1,317	1,747
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Basis of real estate sold		$ (642)	$ (195)	$ (256)
[1]	Included within interest expense on the Consolidated Statements of Operations.
[2]	We do not report rural real estate separate from Timberlands as we do not report these assets separately to management.
[3]	Does not include the acquisition of timber and timberlands, all of which were acquired by the Timberlands segment.
[4]	Real Estate assets primarily consist of the master planned community development and a country club, both located in Arkansas.
[5]	Real Estate capital expenditures include development expenditures of $6.7 million, $7.3 million and $5.0 million for the years ended December 31, 2020, 2019 and 2018, respectively.

Segment Information (Summary _4

Segment Information (Summary of Additional Reportable Segment Financial Information) (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Real estate development expenditures	$ 6,706	$ 7,254	$ 5,049

Earnings per Share (Reconciliat

Earnings per Share (Reconciliation of Number of Shares Used in Calculating Basic and Diluted Earnings per Share) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings per Share [Line Items]
Basic weighted-average shares outstanding	67,237	67,608	60,534
Diluted weighted-average shares outstanding	67,568	67,743	61,814
Performance shares [Member]
Earnings per Share [Line Items]
Incremental shares	289	109	230
Restricted stock units [Member]
Earnings per Share [Line Items]
Incremental shares	42	26	34
Stock portion of earnings and profits distribution [Member]
Earnings per Share [Line Items]
Incremental shares			1,016

Earnings per Share (Narrative)

Earnings per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 12, 2021	Nov. 15, 2018	Aug. 30, 2018	Feb. 20, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings per Share [Line Items]
Total anti-dilutive shares excluded from the calculation (in shares)					1,100	49,500	42,000
Dividend distribution, cash paid					$ 107,853	$ 107,722	$ 102,333
Number of shares repurchased					489,850	686,240	0
Number of shares repurchased, cost					$ 15,364	$ 25,173
Stock repurchase program, remaining amount					$ 59,500
Unsettled repurchase shares					0	0
Maximum [Member]
Earnings per Share [Line Items]
Stock repurchase program, authorized amount			$ 100,000
Deltic [Member]
Earnings per Share [Line Items]
Number of shares issued upon merger				22,000,000
Deltic [Member] | Subsequent Event [Member]
Earnings per Share [Line Items]
Dividend payable, per share	$ 0.41
Distribution, date of declared	Feb. 12, 2021
Distribution, date of record	Mar. 31, 2021
Deltic [Member] | Special Distribution [Member]
Earnings per Share [Line Items]
Number of shares issued upon merger		4,800,000
Distribution payable			$ 222,000
Dividend payable, per share			$ 3.54
Distribution, date of declared			Aug. 30, 2018
Distribution, date to be paid			Nov. 15, 2018
Distribution, date of record			Sep. 27, 2018
Dividend distribution, cash paid		$ 44,400

Inventories (Schedule of Invent

Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Logs	$ 31,210	$ 33,313
Lumber, plywood and veneer	34,136	31,639
Materials and supplies	14,939	12,831
Inventories gross	80,285	77,783
Less: LIFO reserve	(18,249)	(12,002)
Total inventories	$ 62,036	$ 65,781

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Last-In, First-Out Reserve	$ 18,249	$ 12,002

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 517,711	$ 498,113
Less: accumulated depreciation	(229,167)	(211,730)
Total property, plant and equipment, net	288,544	286,383
Land
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	7,333	7,875
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 126,576	123,342
Buildings and Improvements [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Buildings and Improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 377,782	360,570
Machinery and Equipment | Minimum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Machinery and Equipment | Maximum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	25 years
Construction in Progress
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 6,020	$ 6,326

Property, Plant and Equipment_3

Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Depreciation expense	$ 25.2	$ 23.9	$ 22.8

Timber and Timberlands (Schedul

Timber and Timberlands (Schedule of Timber and Timberlands) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Timber And Timberlands [Abstract]
Timber and timberlands	$ 1,516,788	$ 1,554,882
Logging roads	83,273	83,781
Total timber and timberlands, net	$ 1,600,061	$ 1,638,663

Timber and Timberlands (Narrati

Timber and Timberlands (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Timber And Timberlands [Abstract]
Depletion from Company Owned Lands	$ 46.3	$ 41.7	$ 43.9
Amortization of Logging Roads	3.6	$ 3.6	$ 3.4
Future payments due under timber cutting contracts	$ 17.6

Other Assets (Schedule of Other

Other Assets (Schedule of Other Current Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets [Abstract]
Real estate held for sale	$ 8,818	$ 10,974
Prepaid expenses	4,032	3,097
Tax receivables		1,341
Other	3,286	4,771
Total other current assets	$ 16,136	$ 20,183

Other Assets (Schedule of Oth_2

Other Assets (Schedule of Other Long-term Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Assets Noncurrent [Abstract]
Interest rate swaps	$ 18,466	$ 1,601
Operating leases	11,081	15,772
Mineral rights	4,825	5,254
Investment in company owned life insurance (COLI), net	3,328	4,157
Real estate development costs	3,748	3,776
Debt issuance costs	1,288	1,846
Restricted cash		944	$ 2,802
Other	3,981	1,940
Total other long-term assets	$ 46,717	$ 35,290

Accounts Payable and Accrued _3

Accounts Payable and Accrued Liabilities (Schedule of Accounts Payable and Accrued Liabilities) (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued payroll and benefits		$ 29,675	$ 12,920
Accounts payable		9,724	12,734
Accrued interest		6,485	6,946
Accrued taxes		20,780	6,638
Deferred revenue	[1]	8,789	5,514
Operating lease liabilities		4,304	4,998
Other current liabilities		13,522	10,827
Total accounts payable and accrued liabilities		$ 93,279	$ 60,577
[1]

Debt (Schedule of Long-Term Deb

Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2019
Debt Instrument [Line Items]
Long-term principal	$ 762,235	$ 762,235
Debt issuance costs	(1,857)	(2,086)	$ (500)
Unamortized discounts	(3,031)	(3,680)
Total long-term debt	757,347	756,469
Less: current portion of long-term debt	(39,981)	(45,974)
Long-term debt	717,366	710,495
Variable Rate Term Loans [Member]
Debt Instrument [Line Items]
Long-term principal	403,500	397,500
Fixed Rate Term Loans [Member]
Debt Instrument [Line Items]
Long-term principal	290,000	296,000
Revenue Bonds [Member]
Debt Instrument [Line Items]
Long-term principal	65,735	65,735
Medium Term Notes [Member]
Debt Instrument [Line Items]
Long-term principal	$ 3,000	$ 3,000

Debt (Schedule of Long-Term D_2

Debt (Schedule of Long-Term Debt) (Parenthetical) (Details)	1 Months Ended			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2019	Dec. 31, 2020
Debt Instrument [Line Items]
Interest Rate	3.04%	3.17%	4.56%	3.04%
Debt instrument maturity date	2030	2029	2029
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.10%	1.85%	1.85%	1.00%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.875%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.70%
Variable Rate Term Loans [Member]
Debt Instrument [Line Items]
Debt instrument maturity start date				2021
Debt instrument maturity end date				2030
Variable Rate Term Loans [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.85%
Interest rate variable	0.16%			0.16%
Variable Rate Term Loans [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				2.15%
Interest rate variable	0.23%			0.23%
Fixed Rate Term Loans [Member]
Debt Instrument [Line Items]
Debt instrument maturity start date				2022
Debt instrument maturity end date				2025
Fixed Rate Term Loans [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate	4.05%			4.05%
Fixed Rate Term Loans [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest Rate	4.64%			4.64%
Revenue Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	2.75%			2.75%
Debt instrument maturity date				2024
Medium Term Notes [Member]
Debt Instrument [Line Items]
Interest Rate	8.75%			8.75%
Debt instrument maturity date				2022

Debt -Term Loans, Medium Term N

Debt -Term Loans, Medium Term Notes and Revenue Bonds - (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2019	Dec. 31, 2020	Dec. 31, 2009
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 46,000	$ 40,000
Interest Rate	3.04%	3.17%	4.56%	3.04%
Long-term Debt, refinancing amount			$ 150,000
Debt instrument maturity date	2030	2029	2029
Debt Instrument, outstanding amount including redemption premium			$ 4,900
Debt Instrument, lender fee	$ 1,857	$ 2,086	$ 500	$ 1,857
Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	46,000	$ 40,000		46,000
Amended Term Loan Agreement [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 693,500			$ 693,500
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.10%	1.85%	1.85%	1.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt					$ 150,000
Interest Rate					7.50%

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2019	Dec. 31, 2020
Debt Instrument [Line Items]
Unamortized discounts	$ 3,031	$ 3,680		$ 3,031
Debt instrument maturity date	2030	2029	2029
Term Loans [Member]
Debt Instrument [Line Items]
Unamortized discounts	$ 3,000			3,000
Long-term Debt, Gross	100,000			$ 100,000
Debt instrument maturity date				2025
Deltic [Member] | Term Loans [Member]
Debt Instrument [Line Items]
Unamortized discounts	$ 4,900			$ 4,900

Debt (Scheduled Payments Due on

Debt (Scheduled Payments Due on Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Long Term Debt By Maturity [Abstract]
2021	$ 40,000
2022	43,000
2023	40,000
2024	175,735
2025	100,000
Thereafter	363,500
Debt Instrument, Face Amount	$ 762,235	$ 762,235

Debt - Credit Agreement - (Narr

Debt - Credit Agreement - (Narrative) (Details) - USD ($)	1 Months Ended			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2019	Dec. 31, 2020	Feb. 14, 2018	Dec. 31, 2014
Debt Instrument [Line Items]
Unused Capacity, Commitment Fee Percentage				0.20%
Federal Fund Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.50%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.10%	1.85%	1.85%	1.00%
Additional Applicable Rate Added to Base Rate, Minimum	1.30%			1.30%
Base Rate [Member]
Debt Instrument [Line Items]
Additional Applicable Rate Added to Base Rate, Minimum	0.30%			0.30%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.875%
Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.00%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.70%
Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.70%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 380,000,000
Amount available to increase borrowing capacity					420,000,000
Revolving line of credit borrowings	$ 0			$ 0
Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 75,000,000
Line of credit facility, amount outstanding	$ 1,000,000			$ 1,000,000
Swing Line Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 25,000,000

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) $ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2020USD ($)Derivative	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)Derivative	Dec. 31, 2019USD ($)
Derivatives Fair Value [Line Items]
Net losses expected to be reclassified into earnings in the next 12 months			$ 9
Term Loans [Member]
Derivatives Fair Value [Line Items]
Term loan debt	$ 100		100
Interest Rate Swaps [Member]
Derivatives Fair Value [Line Items]
Term loan debt	$ 46		$ 46	$ 40
Interest Rate Swaps [Member] | Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
Number of interest rate swap agreements | Derivative	7		7
Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Minimum [Member]
Derivatives Fair Value [Line Items]
Swaps fixed interest rate	3.04%		3.04%
LIBOR variable interest rate	1.85%		1.85%
Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Swaps fixed interest rate	4.82%		4.82%
LIBOR variable interest rate	2.15%		2.15%
Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Term Loans [Member]
Derivatives Fair Value [Line Items]
Term loan debt	$ 403.5		$ 403.5
Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Term Loans Maturing in December 2020 [Member]
Derivatives Fair Value [Line Items]
Term loan debt	$ 46	$ 46	46
Term loan maturity period	2020-12
Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Term Loans Maturing in December 2020 through January 2029 [Member]
Derivatives Fair Value [Line Items]
Term loan debt		653.5
Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Term Loans Maturing through January 2029 [Member]
Derivatives Fair Value [Line Items]
Term loan debt		$ 607.5
Term loan maturity period		2029-01
Interest Rate Swaps [Member] | Cash Flow Hedging [Member] | Term Loan Maturing December 2030 [Member]
Derivatives Fair Value [Line Items]
Term loan debt	$ 46		$ 46
Swaps fixed interest rate	3.04%		3.04%
Term loan maturity period	2030-12

Derivative Instruments (Fair Va

Derivative Instruments (Fair Value of Cash Flow Derivative Instruments) (Details) - Designated as Hedging Instrument [Member] - Cash Flow Hedging [Member] - Interest rate contracts [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets Current [Member]
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 63
Other Noncurrent Assets [Member]
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value	18,466	$ 1,601
Accounts Payable and Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair Value	1,010
Other Long-term Obligations [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 45,100	$ 22,398

Derivative Instruments (Effect

Derivative Instruments (Effect of Derivatives on Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense, net	[1]	$ 29,463	$ 30,361	$ 35,227
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in other comprehensive income, net of tax		(14,632)	(19,824)	(3,062)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from accumulated other comprehensive loss, net of tax1	[2]	$ (7,451)	$ (1,384)	$ (647)
[1]	Includes amortization of bond discounts and deferred loan fees.
[2]	Realized gains and losses on interest rate contracts consist of net cash received or paid and interest accruals on the interest rate swaps during the periods. Net cash received or paid is included in the supplemental cash flow information within interest, net of amounts capitalized in the Consolidated Statements of Cash Flows .

Fair Value Measurements (Carryi

Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Carrying Amount [Member] | Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion	[1]	$ (759,204)	$ (758,555)
Carrying Amount [Member] | Level 2 [Member] | Interest rate contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative assets		18,529	1,601
Derivative liabilities related to interest rate swaps		(46,110)	(22,398)
Carrying Amount [Member] | Level 2 [Member] | Term Loans [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion		(690,469)	(689,820)
Carrying Amount [Member] | Level 2 [Member] | Revenue bonds [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion		(65,735)	(65,735)
Carrying Amount [Member] | Level 2 [Member] | Medium-term notes [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion		(3,000)	(3,000)
Carrying Amount [Member] | Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Company owned life insurance		3,328	4,157
Fair Value [Member] | Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion	[1]	(788,061)	(775,117)
Fair Value [Member] | Level 2 [Member] | Interest rate contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative assets		18,529	1,601
Derivative liabilities related to interest rate swaps		(46,110)	(22,398)
Fair Value [Member] | Level 2 [Member] | Term Loans [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion		(716,631)	(703,437)
Fair Value [Member] | Level 2 [Member] | Revenue bonds [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion		(67,885)	(68,200)
Fair Value [Member] | Level 2 [Member] | Medium-term notes [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion		(3,545)	(3,480)
Fair Value [Member] | Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Company owned life insurance		$ 3,328	$ 4,157
[1]	The carrying amount of long-term debt includes principal and unamortized discounts

Equity-Based Compensation Pla_3

Equity-Based Compensation Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit, vested, issuance deferred	89,731
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares reserved for future issuance	177,178
Performance stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share award granted under stock incentive plan, performance period	3 years
TSR of performance peer group weighted percentage	50.00%
TSR within NAREIT All Equity REIT weighted percentage	50.00%
Unrecognized compensation cost | $	$ 5.5
Weighted average period (in years)	1 year 6 months
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost | $	$ 2.6
Weighted average period (in years)	1 year 3 months 18 days
Minimum [Member] | Performance stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Actually Issued, as a Percent of the Amount Subject to the Performance Share Award	0.00%
Minimum [Member] | Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Maximum [Member] | Performance stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Actually Issued, as a Percent of the Amount Subject to the Performance Share Award	200.00%
Maximum [Member] | Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Long-Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future use	1,200,000

Equity-Based Compensation Pla_4

Equity-Based Compensation Plans (Details of Equity-Based Compensation Expense and Related Income Tax Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 8,063	$ 7,272	$ 8,206
Deferred compensation stock equivalent units expense	76	72	213
Accelerated share-based termination benefits in connection with the merger			1,812
Total tax benefit recognized for shared-based payment awards	357	314	332
Performance stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	5,083	4,605	4,157
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 2,904	$ 2,595	$ 2,024

Equity-Based Compensation Pla_5

Equity-Based Compensation Plans (Fair Value of Performance Share Awards) (Details) - Performance stock awards [Member] - $ / shares		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price as of valuation date (in dollars per share)		$ 42.16	$ 35.01	$ 54
Risk-free rate		1.42%	2.47%	2.46%
Expected volatility		25.74%	25.15%	23.74%
Expected dividend yield	[1]			2.96%
Expected term (years)		3 years	3 years	3 years
Fair value of a performance share		$ 45.04	$ 37.87	$ 75.37
[1]	Full dividend reinvestment assumed in 2020 and 2019.

Equity-Based Compensation Pla_6

Equity-Based Compensation Plans (Summary of Outstanding Performance Shares/Restricted Stock Units) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Performance stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares outstanding at January 1, Shares	196,007	142,238	200,631
Granted (in shares)	125,001	142,066	67,747
Vested (in shares)	(63,456)	(75,048)	(121,058)
Forfeited (in shares)	(4,286)	(13,249)	(5,082)
Nonvested shares outstanding at December 31, Shares	253,266	196,007	142,238
Total grant date fair value of awards vested during the year	$ 4,783	$ 4,041	$ 3,634
Total fair value of awards vested during the year	3,968	3,561	6,397
Aggregate intrinsic value	$ 12,668	$ 8,481	$ 4,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested shares outstanding at January 1, Weighted Average Grant Date Fair Value (in dollars per share)	$ 50.15	$ 63.91	$ 39.19
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	45.04	37.87	75.37
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	75.37	53.85	30.02
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	47.07	45.35	47.90
Nonvested shares outstanding at December 31, Weighted Average Grant Date Fair Value (in dollars per share)	$ 41.36	$ 50.15	$ 63.91
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares outstanding at January 1, Shares	127,471	72,020	67,871
Granted (in shares)	68,263	104,488	49,193
Vested (in shares)	(52,908)	(43,102)	(41,350)
Forfeited (in shares)	(3,334)	(5,935)	(3,694)
Nonvested shares outstanding at December 31, Shares	139,492	127,471	72,020
Total grant date fair value of awards vested during the year	$ 2,354	$ 1,961	$ 1,089
Total fair value of awards vested during the year	2,196	1,771	1,328
Aggregate intrinsic value	$ 6,977	$ 5,516	$ 2,279
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested shares outstanding at January 1, Weighted Average Grant Date Fair Value (in dollars per share)	$ 39.83	$ 47.66	$ 32.87
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	38.77	36.80	49.96
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	44.48	45.51	26.33
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	40.20	40.26	45.36
Nonvested shares outstanding at December 31, Weighted Average Grant Date Fair Value (in dollars per share)	$ 37.54	$ 39.83	$ 47.66

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Balance Sheet Information Related Leases (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
ASSETS
Operating lease assets		$ 11,081	$ 15,772
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Finance lease assets	[1]	$ 7,206	$ 2,360
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		us-gaap:PropertyPlantAndEquipmentNet	us-gaap:PropertyPlantAndEquipmentNet
Total lease assets		$ 18,287	$ 18,132
Current liabilities:
Operating lease liabilities		$ 4,304	$ 4,998
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Finance lease liabilities		$ 2,202	$ 644
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Noncurrent
Operating lease liabilities		$ 6,835	$ 10,775
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]		us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Finance lease liabilities		$ 4,914	$ 1,703
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]		us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities		$ 18,255	$ 18,120
[1]	Finance lease assets are presented net of accumulated amortization of $1.7 million and $0.3 million as of December 31, 2020 and 2019, respectively.

Leases - Schedule of Suppleme_2

Leases - Schedule of Supplemental Balance Sheet Information Related Leases (Parentheticals) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Accumulated amortization of finance lease assets	$ 1.7	$ 0.3

Leases - Schedule of Weighted A

Leases - Schedule of Weighted Average Remaining Terms and Discount Rate (Details)	Dec. 31, 2020	Dec. 31, 2019
Weighted-average remaining terms (years)
Operating leases	3 years 9 months 18 days	4 years 2 months 19 days
Finance leases	3 years 7 months 2 days	3 years 9 months 29 days
Weighted-average discount rate
Operating leases	4.13%	4.17%
Finance leases	2.76%	3.54%

Leases - Schedule of Components

Leases - Schedule of Components of Lease Expense (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease costs	[1]	$ 5,640	$ 5,938	$ 4,989
Finance lease costs:
Amortization of leased assets		1,451	269
Interest on lease assets		153	40
Net lease costs		$ 7,244	$ 6,247	$ 4,989
[1]	Excludes short-term leases and variable lease costs, which are immaterial.

Leases - Schedule of Suppleme_3

Leases - Schedule of Supplemental Cash Flow Information Related Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 5,627	$ 5,963
Operating cash flows for finance leases	153	40
Financing cash flows for finance leases	1,526	283
Leased assets exchanged for new lease liabilities:
Operating leases	447	7,135
Finance leases	$ 6,295	$ 2,630

Leases - Schedule of Maturity o

Leases - Schedule of Maturity of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2020USD ($)
Operating Leases
2021	$ 4,670
2022	2,834
2023	1,879
2024	986
2025	692
After 2025	1,000
Total lease payments	12,061
Less: interest	922
Present value of lease liabilities	11,139
Finance Leases
2021	2,369
2022	2,278
2023	1,589
2024	868
2025	276
After 2025	91
Total lease payments	7,471
Less: interest	355
Present value of lease liabilities	$ 7,116

Income Taxes (Schedule of Incom

Income Taxes (Schedule of Income Tax Provision (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current	$ 41,733	$ 12,055	$ 7,038
Deferred	(14,610)	(11,082)	11,370
Net operating loss carryforwards		37	791
Income taxes	$ 27,123	$ 1,010	$ 19,199

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Statutory Federal Income Tax Rate	21.00%
Unrecognized tax benefits that would impact effective tax rate	$ 0	$ 0
Idaho [Member]
Income Taxes [Line Items]
Investment Tax Credits	$ 1,900,000
Earliest Tax Year [Member] | Idaho [Member]
Income Taxes [Line Items]
Idaho Investment Tax Credits expiration year	2026
Latest Tax Year [Member] | Idaho [Member]
Income Taxes [Line Items]
Idaho Investment Tax Credits expiration year	2034
Federal [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 0
State and Local [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 0

Income Taxes (Schedule of Recon

Income Taxes (Schedule of Reconciliation of Income Tax Provision (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax	$ 40,730	$ 11,901	$ 29,837
REIT income not subject to federal income tax	(16,949)	(11,285)	(8,773)
Pension contribution deducted at higher tax rate			(5,665)
Change in valuation allowance	(395)	(395)
State income taxes, net of federal income tax	4,458	903	3,712
Permanent book-tax differences	(1,315)	(793)	(771)
Other items, net	594	679	859
Income taxes	$ 27,123	$ 1,010	$ 19,199
Effective tax rate	14.00%	1.80%	13.50%

Income Taxes (Schedule of Compo

Income Taxes (Schedule of Components of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Pension and other postretirement employee benefits	$ 34,703	$ 32,110
Inventories	552	754
Tax credits	1,519	2,190
Nondeductible accruals	2,005	815
Incentive compensation	971	1,044
Employee benefits	1,323	1,316
Other	1,110	1,296
Total deferred tax assets	42,183	39,525
Valuation allowance		(395)
Deferred tax assets, net of valuation allowance	42,183	39,130
Timber and timberlands, net	(354)	(965)
Property, plant and equipment, net	(52,698)	(50,901)
Intangible assets, net	(3,656)	(3,778)
Real estate development	(1,236)	(1,402)
Other	(1,979)	(2,249)
Total deferred tax liabilities	(59,923)	(59,295)
Deferred tax liabilities, net	$ (17,740)	$ (20,165)

Income Taxes (Summary of Tax Ye

Income Taxes (Summary of Tax Years Subject to Examination by Major Taxing Jurisdictions) (Details)	12 Months Ended
	Dec. 31, 2020
Federal [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2017
Federal [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2020
State and Local [Member] | Arkansas [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2017
State and Local [Member] | Arkansas [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2020
State and Local [Member] | Idaho [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2017
State and Local [Member] | Idaho [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2020
State and Local [Member] | Michigan [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2016
State and Local [Member] | Michigan [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2020
State and Local [Member] | Minnesota [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2016
State and Local [Member] | Minnesota [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years subject to examination	2020

Income Taxes (Summary of Reconc

Income Taxes (Summary of Reconciliation of Unrecognized Tax Benefits) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Income Tax Disclosure [Abstract]
Balance at January 1	$ 564
Additions for tax positions of prior years	0
Reduction for tax positions of prior years	(564)
Balance at December 31	$ 0

Savings Plans, Pension Plans _3

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 29, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			$ 3,600,000	$ 3,900,000	$ 3,700,000
Accumulated benefit obligation			390,300,000	458,100,000
Funding of pension and other postretirement benefit plans			10,004,000	5,678,000	$ 57,580,000
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments in Level 3			0	$ 0
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year			$ 1,800,000
Accumulated Other Comprehensive Loss [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease in accumulated postretirement benefit obligations						$ 76,700,000
Management Deferred Compensation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Annual incentive plan, employee permitted minimum defer percentage			50.00%
Annual incentive plan, employee permitted maximum defer percentage			100.00%
Management Deferred Compensation Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Basic salary defer percentage			50.00%
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Change in monthly retirement benefit amount	$ 0
Non-cash pretax settlement charge	43,000,000
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year			$ 21,923,000
Pension Plans [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to measure projected benefit obligations for qualified pension plans			2.95%	3.40%
Pension Plans [Member] | Qualified Plan [Member] | Funded with Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Transfer of outstanding pension benefit obligation related to qualified pension plans to insurance company	$ 101,100,000
Reduction in funded status of qualified pension plans		$ 26,200,000
Pension Plans [Member] | Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year			$ 2,400,000
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year			4,211,000
Other Postretirement Benefit Plans [Member] | Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year			$ 4,200,000
Non Deltic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year			4.50%
Non Deltic Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next fiscal year			6.36%
Non Deltic Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next fiscal year			7.05%
Deltic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next fiscal year			6.78%
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year			4.50%

Savings Plans, Pension Plans _4

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Changes in Benefit Obligation, Plan Assets and Funded Status for Pension and OPEB Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts recognized in the consolidated balance sheets [Abstract]
Noncurrent liabilities	$ (128,807)	$ (115,463)
Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	(474,237)	(427,909)
Service cost	(8,932)	(7,767)	$ (8,454)
Interest cost	(12,263)	(18,465)	(16,992)
Actuarial loss	(38,366)	(53,446)
Benefits paid	23,614	33,350
Plan settlements	101,755
Benefit obligation at end of year	(408,429)	(474,237)	(427,909)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	398,468	351,285
Actual return on plan assets	46,672	78,448
Employer contributions and benefit payments	6,019	2,085
Benefits paid	(23,614)	(33,350)
Plan settlements	(101,755)
Fair value of plan assets at end of year	325,790	398,468	351,285
Amounts recognized in the consolidated balance sheets [Abstract]
Current liabilities	(2,363)	(2,152)
Noncurrent assets	1,907
Noncurrent liabilities	(82,183)	(73,617)
Funded status	(82,639)	(75,769)
OPEB [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	(46,395)	(40,032)
Service cost	(508)	(371)	(341)
Interest cost	(1,502)	(1,588)	(1,482)
Actuarial loss	(6,415)	(7,997)
Benefits paid	3,985	3,593
Benefit obligation at end of year	(50,835)	(46,395)	$ (40,032)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions and benefit payments	3,985	3,593
Benefits paid	(3,985)	(3,593)
Amounts recognized in the consolidated balance sheets [Abstract]
Current liabilities	(4,211)	(4,549)
Noncurrent liabilities	(46,624)	(41,846)
Funded status	$ (50,835)	$ (46,395)

Savings Plans, Pension Plans _5

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Pension Plans with Projected Benefit Obligations Greater than Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Savings Plans Pension Plans And Other Postretirement Employee Benefits [Abstract]
Projected benefit obligations	$ 350,091	$ 474,237
Fair value of plan assets	$ 265,546	$ 398,468

Savings Plans, Pension Plans _6

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Pension Plans with Accumulated Benefit Obligations Greater than Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Savings Plans Pension Plans And Other Postretirement Employee Benefits [Abstract]
Accumulated benefit obligations	$ 332,012	$ 458,106
Fair value of plan assets	$ 265,546	$ 398,468

Savings Plans, Pension Plans _7

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Long-Term Targeted Asset Allocation Ranges) (Details) - Pension Plans [Member]	Dec. 31, 2020
Global Equities [Member] | Minimum [Member]
Long-term targeted asset allocation	26.00%
Global Equities [Member] | Maximum [Member]
Long-term targeted asset allocation	38.00%
Fixed Income Securities [Member] | Minimum [Member]
Long-term targeted asset allocation	44.00%
Fixed Income Securities [Member] | Maximum [Member]
Long-term targeted asset allocation	64.00%
Alternative Securities [Member] | Minimum [Member]
Long-term targeted asset allocation	10.00%
Alternative Securities [Member] | Maximum [Member]
Long-term targeted asset allocation	16.00%
Cash and Cash Equivalents [Member] | Minimum [Member]
Long-term targeted asset allocation	0.00%
Cash and Cash Equivalents [Member] | Maximum [Member]
Long-term targeted asset allocation	5.00%

Savings Plans, Pension Plans _8

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Actual Plan Asset Allocations of the Pension Benefit Plans' Assets) (Details) - Pension Plans [Member]	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Global Equities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	32.00%	32.00%
Fixed Income Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	53.00%	54.00%
Other (Includes Cash and Cash Equivalents and Alternatives) [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	15.00%	14.00%

Savings Plans, Pension Plans _9

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Assets within Defined Benefit Pension Plans Invested) (Details) - Pension Plans [Member] - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value of Plan Assets		$ 325,790	$ 398,468	$ 351,285
Cash and Cash Equivalents [Member]
Fair Value of Plan Assets		5,571	6,671
Global Equity Securities [Member]
Fair Value of Plan Assets	[1]	104,775	127,688
Fixed Income Securities [Member]
Fair Value of Plan Assets	[2]	172,909	214,018
Alternative Securities [Member]
Fair Value of Plan Assets	[3]	42,535	50,091
Level 1 [Member]
Fair Value of Plan Assets		296,296	357,914
Level 1 [Member] | Cash and Cash Equivalents [Member]
Fair Value of Plan Assets		5,571	6,671
Level 1 [Member] | Global Equity Securities [Member]
Fair Value of Plan Assets	[1]	104,775	127,688
Level 1 [Member] | Fixed Income Securities [Member]
Fair Value of Plan Assets	[2]	143,415	173,464
Level 1 [Member] | Alternative Securities [Member]
Fair Value of Plan Assets	[3]	42,535	50,091
Level 2 [Member]
Fair Value of Plan Assets		29,494	40,554
Level 2 [Member] | Fixed Income Securities [Member]
Fair Value of Plan Assets	[2]	$ 29,494	$ 40,554
[1]	Level 1 assets are international and domestic managed investments that track the MSCI All-Country World Index.
[2]	Level 1 assets are investments in a diversified portfolio of fixed income instruments of varying maturities representing corporates, U.S. treasuries, municipals and futures. Level 2 assets are thinly traded investments in a diversified portfolio of fixed income instruments of varying maturities representing mostly corporates securities.  Both Level 1 & Level 2 investments track the Bloomberg Barclay’s Long-term Credit Index.
[3]	Level 1 assets are long-term investment funds which are invested in tangible assets and real asset companies such as, infrastructure, natural resources and timber.

Savings Plans, Pension Plans_10

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Pre-Tax Components Of Net Periodic Cost (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8,932	$ 7,767	$ 8,454
Interest cost	12,263	18,465	16,992
Expected return on plan assets	(15,474)	(22,190)	(20,035)
Amortization of prior service cost (credit)	111	211	186
Amortization of actuarial loss	15,426	13,497	16,589
Net periodic cost (benefit) before pension settlement charge	21,258	17,750	22,186
Pension settlement charge	42,988
Net periodic cost (benefit)	64,246	17,750	22,186
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	508	371	341
Interest cost	1,502	1,588	1,482
Amortization of prior service cost (credit)	(1,274)	(8,844)	(8,877)
Amortization of actuarial loss	1,672	1,012	1,311
Net periodic cost (benefit) before pension settlement charge	2,408	(5,873)	(5,743)
Net periodic cost (benefit)	$ 2,408	$ (5,873)	$ (5,743)

Savings Plans, Pension Plans_11

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Amounts Recorded in AOCI on Consolidated Balance Sheets, Not Recognized as Components of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Pension Plans [Member]
Net loss	$ 78,859	$ 116,780
Prior service cost (credit)	166	248
Total amount unrecognized	79,025	117,028
OPEB [Member]
Net loss	15,947	12,437
Prior service cost (credit)	(1,164)	(2,106)
Total amount unrecognized	$ 14,783	$ 10,331

Savings Plans, Pension Plans_12

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Schedule of Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2020USD ($)
Pension Plans [Member]
2021	$ 21,923
2022	22,386
2023	22,649
2024	22,638
2025	22,519
2026–2030	110,216
OPEB [Member]
2021	4,211
2022	3,730
2023	3,556
2024	3,274
2025	3,018
2026–2030	$ 13,300

Savings Plans, Pension Plans_13

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Weighted Average Assumptions Used to Determine the Benefit Obligation for Non-Deltic and Deltic Plans) (Details)	Dec. 31, 2020	Dec. 31, 2019
Pension Plans [Member] | Non-Deltic Plans [Member]
Discount rate	2.65%	3.40%
Rate of salaried compensation increase	3.00%	3.00%
Pension Plans [Member] | Deltic Plans [Member]
Discount rate	2.65%	3.40%
Rate of salaried compensation increase	4.00%	4.00%
OPEB [Member] | Non-Deltic Plans [Member]
Discount rate	2.60%	3.40%
OPEB [Member] | Deltic Plans [Member]
Discount rate	2.60%	3.40%

Savings Plans, Pension Plans_14

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Weighted Average Assumptions Used to Determine the Net Periodic Cost (Benefit) for Non-Deltic and Deltic Plans) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans [Member] | Non-Deltic Plans [Member]
Discount rate	3.40%	4.40%	3.85%
Expected return on plan assets	5.75%	6.25%	6.25%
Rate of salaried compensation increase	3.00%	3.00%	3.00%
Pension Plans [Member] | Deltic Plans [Member]
Discount rate	3.40%	4.40%	4.30%
Expected return on plan assets	5.75%	6.25%	6.25%
Rate of salaried compensation increase	4.00%	4.00%	4.00%
OPEB [Member] | Non-Deltic Plans [Member]
Discount rate	3.40%	4.40%	3.65%
OPEB [Member] | Deltic Plans [Member]
Discount rate	3.40%	4.40%	4.30%

Components of Accumulated Oth_3

Components of Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	$ (1,226,831)	$ (1,314,779)
Effect of pension settlement	(31,811)
Balance at end of period	(1,304,953)	(1,226,831)
Pension Plans [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	117,028	129,253
Net loss (gain) arising during the period	5,306	(2,081)
Effect of pension settlement	(31,811)
Amounts reclassified from AOCL to earnings	(11,498)	(10,144)
Balance at end of period	79,025	117,028
Other Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	10,331	(1,382)
Net loss (gain) arising during the period	4,747	5,917
Amounts reclassified from AOCL to earnings	(295)	5,796
Balance at end of period	14,783	10,331
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	20,000	1,560
Net loss (gain) arising during the period	14,632	19,824
Amounts reclassified from AOCL to earnings	(7,451)	(1,384)
Balance at end of period	27,181	20,000
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	147,359	129,431
Balance at end of period	$ 120,989	$ 147,359