Basis of Presentation (Policies)	9 Months Ended
Sep. 30, 2022
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 nine states. We are engaged in activities associated with timberland management, including the sale of timber, the management of approximately 2.2 million acres of timberlands and the purchase and sale of timberlands. We are also engaged in the manufacturing 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.
Condensed Consolidated Financial Statements	Condensed Consolidated Financial Statements The accompanying unaudited Condensed Consolidated Financial Statements provide an overall view of our results and financial condition and reflect all adjustments that are, in the opinion of management, necessary for a fair presentation of our financial position, results of operations and cash flows for the interim periods presented. Except as otherwise disclosed in these Notes to Condensed Consolidated Financial Statements, such adjustments are of a normal, recurring nature. Intercompany transactions and accounts have been eliminated in consolidation. The Condensed Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission pertaining to interim financial statements. Certain disclosures normally provided in accordance with accounting principles generally accepted in the United States (GAAP) have been omitted. This Quarterly Report on Form 10-Q should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2021, as filed with the Securities and Exchange Commission on February 17, 2022. Results of operations for interim periods should not be regarded as necessarily indicative of the results that may be expected for the full year.
Use of Estimates	Use of Estimates The preparation of our Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and requires judgments affecting the amounts reported in the financial statements and the accompanying notes. Actual results may differ materially from our estimates.
Business Combinations and Acquisitions	Business Combinations and Acquisitions We apply the principles provided in the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 805, Business Combinations, to determine whether an acquisition involves an asset or a business. In determining whether an acquisition should be accounted for as a business combination or asset acquisition, we first determine whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If this is the case, the single identifiable asset or the group of similar assets is accounted for as an asset acquisition. If this is not the case, we then further evaluate whether the single identifiable asset or group of similar identifiable assets and activities includes, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs. If so, the transaction is accounted for as a business combination. We account for business combinations using the acquisition method of accounting which requires that (i) identifiable assets acquired (including identifiable intangible assets) and liabilities assumed generally be measured and recognized at fair value as of the acquisition date and (ii) the excess of the purchase price over the net fair value of identifiable assets acquired and liabilities assumed be recognized as goodwill, which is not amortized for accounting purposes but is subject to testing for impairment at least annually. We measure and recognize asset acquisitions that are not deemed to be business combinations based on the cost to acquire the assets. Goodwill is not recognized in an asset acquisition with any consideration in excess of net assets acquired allocated to acquired assets on a relative estimated fair value basis. Transaction costs are expensed in a business combination and transaction costs directly attributable to the acquisition are considered a component of the cost of the acquisition in an asset acquisition. See Note 13: CatchMark Merger for additional information.
Commitments and Contingencies	Commitments and 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 material adverse effect on our consolidated financial position, operating results or net cash flow.
New Accounting Standards Being Evaluated	New Accounting Standards 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. ASU 2020-04 contains practical expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The expedients and exceptions provided by this guidance apply only to contracts, hedging relationships, and other transactions that reference the London Interbank Offered Rate (LIBOR) or another reference rate expected to be discontinued as a result of reference rate reform. The U.S. Federal Reserve, in conjunction with the Alternative Reference Rate Committee, a steering committee comprised of large U.S. financial institutions, has recommended replacing LIBOR with the Secured Overnight Financing Rate (SOFR). The guidance in ASU 2020-04, which can be applied immediately, is optional and may be elected over time as reference rate reform activities occur. This guidance is not applicable to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022. Unlike other topics, the provisions of this update are only available until December 31, 2022, when the reference rate replacement activity was expected to be completed. Our credit agreement, variable rate term loans with $403.5 million in principal and the associated interest rate swaps, and $290.0 million of forward starting interest rate swaps have an interest rate tied to LIBOR. We are working with our lenders and counterparties to modify the benchmark rate from LIBOR to SOFR in our variable rate term loans and interest rate derivative agreements. We expect to complete this conversion by the end of 2022. We do not expect our adoption of ASU 2020-04 will have a material impact on our consolidated financial statements.

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Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.

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Disclosure of accounting policy for commitments and contingencies, which may include policies for recognizing and measuring loss and gain contingencies.

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Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

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Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

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