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Commitments and contingencies | 12 Months Ended
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Dec. 31, 2025
Commitments and Contingencies Disclosure [Abstract] |
Commitments and contingencies | Commitments and contingencies We are party to claims and lawsuits arising out of our business and that of our consolidated subsidiaries, which may include, but are not limited to, matters involving property damage, personal injury, and environmental, contractual and statutory obligations. We accrue a liability for those contingencies when the incurrence of a loss is probable, and the amount can be reasonably estimated. If a range of amounts can be reasonably estimated and no amount within the range is a better estimate than any other amount, then the minimum of the range is accrued. We do not accrue liabilities when the likelihood that the liability has been incurred is probable, but the amount cannot be reasonably estimated or when the liability is believed to be only reasonably possible or remote. For contingencies where an unfavorable outcome is probable or reasonably possible and which are material, we disclose the nature of the contingency and, in some circumstances, an estimate of the possible loss. Accruals are based on the best information available, but in certain situations management is unable to estimate an amount or range of a reasonably possible loss, including, but not limited to, when: (1) the damages are unsubstantiated or indeterminate, (2) the proceedings are in the early stages, (3) numerous parties are involved, or (4) the matter involves novel or unsettled legal theories. At December 31, 2025 and 2024, we accrued liabilities which have not been discounted, of $3.3 million and $6.6 million, respectively. At December 31, 2025 and 2024, we also recorded corresponding insurance receivables of $0 and $459,000, respectively, related to the accrued liabilities. The accruals are for contingencies, including litigation and environmental matters. Most of these claims and lawsuits are covered by insurance, thus our exposure is typically limited to our deductible amount. We will continue to monitor each matter and adjust accruals as might be warranted based on new information and further developments. Management believes that the outcomes with respect to probable and reasonably possible losses in excess of the amounts accrued, net of insurance recoveries, while uncertain, either cannot be estimated or will not have a material effect upon our financial position, results of operations or cash flows. Unless otherwise required by GAAP, legal costs are expensed as they are incurred. Environmental matters Portland Harbor Site. In 1999, Knife River - Northwest acquired a commercial property along the portion of the Williamette River know as the Portland Harbor from Georgia-Pacific West, Inc. (the “Linnton Property”). In December 2000, the EPA designated portions of the Portland Harbor, including the area encompassing the Linnton Property, as a Superfund site due to sediment contamination (the “Portland Harbor Site” or “Site”). The EPA has issued General Notice Letters to more than 150 parties, including Knife River - Northwest, indicating that the recipients could potentially be liable for investigation and remediation costs associated with the Portland Harbor Site. Liability for those costs may be joint and serval between the potentially responsible parties (“PRPs”). We have joined with approximately 100 other PRPs, in a voluntary, non-judicial mediation process to try and allocate those cleanup costs. This process remains ongoing. In January 2017, the EPA issued a Record of Decision (“ROD”) identifying its preferred remedy to address the sediment contamination, including a combination of sediment removal, capping, enhanced and monitored natural recovery, and riverbank improvements depending on the particular part of the river. This remedy, which will not begin until the EPA has approved remedial design and remedial action plans from the PRPs, was expected to require 13 years of active remediation and cost $1 billion to $2 billion. The EPA has, through voluntary consent agreements or unilateral administrative orders, engaged certain PRPs to perform the remedial design work throughout the Site. We are not a party to any of the voluntary consent agreements or unilateral administrative orders. Remedial design work is ongoing for 100 percent of the Site, but Site-wide remediation activities are not expected to begin for several years as different parts of the Site are at different stages of the remedial design process. While it is not presently possible to estimate the total cleanup costs given the large number of PRPs and the variation in the ROD remedy across the Site, costs for the ROD remedy are likely to increase given the anticipated timeline for implementation. In November 2024, EPA initiated the negotiation process for a consent decree that would govern remediation as well as long-term site monitoring by issuing Special Notice Letters to approximately 60 PRPs. Knife River– Northwest did not receive a Special Notice Letter. Separate from the EPA’s remediation and allocation process, we have also been notified that the Portland Harbor Natural Resource Trustee Council (the “Trustees”) intends to perform a natural resource injury assessment for damage resulting from the release of hazardous substances at the Site. Until that assessment is complete, there is not adequate information to estimate the cost of any natural resource damages or the allocation to any PRP. The Trustees may seek to negotiate their own settlements or take other legal action against parties responsible for those damages. We do not expect that we will incur material costs related to remediation or natural resource damages. Additionally, we believe Georgia-Pacific West, Inc. and its successors – are required to indemnify Knife River – Northwest under the Linnton Property sale agreement for any costs and liabilities incurred in relation to the Portland Harbor Site and have notified them accordingly. Purchase commitments We have entered into various commitments, largely purchased cement, liquid asphalt, minimum royalties and fuel. The commitment terms vary in length, up to 45 years. The commitments under these contracts as of December 31, 2025, were:
| 2026 |  | 2027 |  | 2028 |  | 2029 |  | 2030 |  | Thereafter
| (In thousands)
Purchase commitments | $ | 42,868 |  |  | $ | 33,328 |  |  | $ | 32,732 |  |  | $ | 32,507 |  |  | $ | 2,264 |  |  | $ | 10,534 |
These commitments were not reflected in our audited consolidated financial statements. Amounts purchased under various commitments for the years ended December 31, 2025, 2024 and 2023 were $135.3 million, $128.3 million and $128.7 million, respectively. Guarantees We have outstanding obligations to third parties where we have guaranteed their performance. These guarantees are related to contracts for contracting services and certain other guarantees. At December 31, 2025, the fixed maximum amounts guaranteed under these agreements aggregated $11.5 million, all of which have no scheduled maturity date. Certain of the guarantees also have no fixed maximum amounts specified. There were no amounts outstanding under the previously mentioned guarantees at December 31, 2025. We have outstanding letters of credit to third parties related to insurance policies, reclamation obligations and other agreements. At December 31, 2025, the fixed maximum amounts guaranteed under these letters of credit aggregated to $23.4 million. The amounts of scheduled expiration of the maximum amounts guaranteed under these letters of credit aggregate to $11.9 million in 2026, $11.3 million in 2027 and $175,000 in 2028. There were no amounts outstanding under the previously mentioned letters of credit at December 31, 2025. In the normal course of business, we have surety bonds related to contracts for contracting services and reclamation obligations of its subsidiaries. In the event a subsidiary of ours does not fulfill a bonded obligation, we would be responsible to the surety bond company for completion of the bonded contract or obligation. A large portion of the surety bonds is expected to expire within the next 12 months; however, we will likely continue to enter into surety bonds for its subsidiaries in the future. At December 31, 2025, approximately $858.3 million of surety bonds were outstanding, which were not reflected on the Consolidated Balance Sheet.

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